diff --git a/resource_type/music.gd b/resource_type/music.gd
index a9d8ce8..33547af 100644
--- a/resource_type/music.gd
+++ b/resource_type/music.gd
@@ -1,3 +1,5 @@
+## Class that packs an [AudioStream] with additional information
+## to sync beats to it.
 class_name Music extends Resource
 
 ## Music AudioStream.
diff --git a/rhythm_game/note/lane_view.gd b/rhythm_game/note/lane_view.gd
new file mode 100644
index 0000000..b6f07db
--- /dev/null
+++ b/rhythm_game/note/lane_view.gd
@@ -0,0 +1,21 @@
+## A NoteView that stores notes that exist on a lane.
+class_name LaneView extends NoteView
+
+## The lane notes will be filtered by.
+@export var lane: int
+
+## Get the array this LaneView refers to.
+func get_data() -> NoteSubset:
+	return _lane_notes
+
+func update_current_beat(beat: float) -> void:
+	_current_beat = beat
+	_update_view_relative_to_notes(_lane_notes)
+
+# ======== Implementation ======== #
+var _lane_notes: NoteSubset
+
+func _set_data(p_notes: NoteArray) -> void:
+	notes = p_notes
+	_lane_notes = NoteSubset.get_notes_in_lane(p_notes, lane)
+	_reset_view()
diff --git a/rhythm_game/note/lane_view.gd.uid b/rhythm_game/note/lane_view.gd.uid
new file mode 100644
index 0000000..79fa2f9
--- /dev/null
+++ b/rhythm_game/note/lane_view.gd.uid
@@ -0,0 +1 @@
+uid://cq818ut4pmunn
diff --git a/rhythm_game/note.gd b/rhythm_game/note/note.gd
similarity index 100%
rename from rhythm_game/note.gd
rename to rhythm_game/note/note.gd
diff --git a/rhythm_game/note.gd.uid b/rhythm_game/note/note.gd.uid
similarity index 100%
rename from rhythm_game/note.gd.uid
rename to rhythm_game/note/note.gd.uid
diff --git a/rhythm_game/note/note_array.gd b/rhythm_game/note/note_array.gd
new file mode 100644
index 0000000..22af288
--- /dev/null
+++ b/rhythm_game/note/note_array.gd
@@ -0,0 +1,44 @@
+## An array of notes, stored as arrays of data.
+## Notes are assumed to be sorted in ascending order by beat.
+class_name NoteArray extends Node
+
+## The ID of the note at [param index].
+func id_at(index: int) -> int:
+	return index
+
+## The beat of the note at [param index].
+func beat_at(index: int) -> float:
+	return _beats.get(index)
+
+## The type of the note at [param index].
+func type_at(index: int) -> Note.TYPE:
+	return _types.get(index)
+
+## The lane of the note at [param index].
+func lane_at(index: int) -> int:
+	return _lanes.get(index)
+
+## The number of notes in the array.
+func size() -> int:
+	return _beats.size()
+
+## Remove all notes in the array.
+func clear() -> void:
+	_beats = []
+	_types = []
+	_lanes = []
+
+# ======= IMPLEMENTATION ======= #
+var _beats: Array[float] = []
+var _types: Array[Note.TYPE] = []
+var _lanes: Array[int] = []
+
+func _append_note(note: Note) -> void:
+	_beats.append(note.hit_beat)
+	_types.append(note.type)
+	_lanes.append(note.lane)
+
+func _append_note_data(beat: float, type: Note.TYPE, lane: int) -> void:
+	_beats.append(beat)
+	_types.append(type)
+	_lanes.append(lane)
diff --git a/rhythm_game/note/note_array.gd.uid b/rhythm_game/note/note_array.gd.uid
new file mode 100644
index 0000000..5413325
--- /dev/null
+++ b/rhythm_game/note/note_array.gd.uid
@@ -0,0 +1 @@
+uid://8isyo4pxyj1r
diff --git a/rhythm_game/note/note_subset.gd b/rhythm_game/note/note_subset.gd
new file mode 100644
index 0000000..9c1a22d
--- /dev/null
+++ b/rhythm_game/note/note_subset.gd
@@ -0,0 +1,25 @@
+## Contain a subset of notes in a [NoteArray].
+## Notes are expected to be sorted in ascending order by beat.
+## The original index of a note can be found with [method id_at].
+class_name NoteSubset extends NoteArray
+
+## The array where notes in this subset come from.
+var full_set: NoteArray
+
+## The ID (index of note in full_set) of the note at [param index].
+func id_at(index) -> int:
+	return _ids.get(index)
+
+## Parse the given [param notes] and return a [class NoteSubset]
+## containing only notes in [param lane].
+static func get_notes_in_lane(notes: NoteArray, lane: int) -> NoteSubset:
+	var lane_notes: NoteSubset = NoteSubset.new()
+	lane_notes.full_set = notes
+	for i in range(notes.size( )):
+		if notes.lane_at(i) == lane:
+			lane_notes._ids.append(i)
+			lane_notes.append_note_data(notes.beat_at(i), notes.type_at(i), lane)
+	return lane_notes
+
+## ====== IMPLEMENTATION ====== #
+var _ids: Array[int] = []
diff --git a/rhythm_game/note/note_subset.gd.uid b/rhythm_game/note/note_subset.gd.uid
new file mode 100644
index 0000000..8346727
--- /dev/null
+++ b/rhythm_game/note/note_subset.gd.uid
@@ -0,0 +1 @@
+uid://dhaxabkmyajjv
diff --git a/rhythm_game/note/note_view.gd b/rhythm_game/note/note_view.gd
new file mode 100644
index 0000000..09d8661
--- /dev/null
+++ b/rhythm_game/note/note_view.gd
@@ -0,0 +1,19 @@
+## Gets a range of notes in a NoteData relative to a current beat.
+class_name NoteView extends View
+
+## The full set of notes.
+@export var notes: NoteArray = null: set = _set_notes
+
+## Get the array this NoteView refers to.
+func get_data() -> NoteArray:
+	return notes
+
+func update_current_beat(beat: float) -> void:
+	_current_beat = beat
+	_update_view_relative_to_notes(notes)
+
+# ======= IMPLEMENTATION ======= #
+
+func _set_notes(p_notes: NoteArray) -> void:
+	notes = p_notes
+	_reset_view()
diff --git a/rhythm_game/note/note_view.gd.uid b/rhythm_game/note/note_view.gd.uid
new file mode 100644
index 0000000..94967b4
--- /dev/null
+++ b/rhythm_game/note/note_view.gd.uid
@@ -0,0 +1 @@
+uid://c7h7ue6kjgoha
diff --git a/rhythm_game/note/view.gd b/rhythm_game/note/view.gd
new file mode 100644
index 0000000..d5dfcb4
--- /dev/null
+++ b/rhythm_game/note/view.gd
@@ -0,0 +1,68 @@
+## Abstract class representing a range of notes in some kind of array,
+## expressed by a beginning index and an ending index: [begin, end).
+@abstract class_name View extends Node
+
+## Get the array this View refers to.
+@abstract func get_data() -> Variant
+
+## Update the view to be relative to beat.
+## Can be connected to a beat update signal.
+@abstract func update_current_beat(beat: float) -> void
+
+## Beginning of the range relative to te current beat where notes will be visible.
+## Any notes where (hit_beat < current_beat + offset_begin) will NOT be visible.
+@export var offset_begin: float = -4.0
+
+## End of the range relative to the current beat where notes will be visible.
+## Any notes where (hit_beat > current_beat + offset_end) will NOT be visible.
+@export var offset_end: float = 4.0
+
+## Return the index to the first element.
+func begin() -> int:
+	return _begin
+
+## Return the index after the last element (equal to last index + 1).
+func end() -> int:
+	return _end
+
+## Size of the range encompassed by begin() and end().
+func size() -> int:
+	return int(_begin >= 0) * _end - _begin
+
+# ======= IMPLEMENETATION ======= #
+var _begin: int = -1
+var _end: int = -1
+
+var _current_beat: float = -999
+var _previous_beat: float = -999
+
+func _reset_view() -> void:
+	_begin = -1
+	_end = -1
+	_current_beat = -999
+	_previous_beat = -999
+
+## Update the view to match _current_beat.
+func _update_view_relative_to_notes(notes: NoteArray) -> void:
+	var new_begin = _begin
+	var new_end = _end
+	if _current_beat > _previous_beat:
+		# Update forward.
+		while(new_begin < notes.size()) and (notes.beat_at(new_begin) < _current_beat + offset_begin):
+			new_begin += 1
+		while(new_end < notes.size()) and (notes.beat_at(new_end) <= _current_beat + offset_end):
+			new_end += 1
+	elif _current_beat < _previous_beat:
+		# Update backward.
+		while(new_begin >= 0) and (notes.beat_at(new_begin) >= _current_beat + offset_begin):
+			_begin -= 1
+		while(new_end >= 0) and (notes.beat_at(new_end) > _current_beat + offset_end):
+			new_end -= 1
+		if(new_begin != _begin):
+			new_begin += 1
+		if(new_end != _end):
+			new_end += 1
+	
+	_begin = new_begin
+	_end = new_end
+	_previous_beat = _current_beat
diff --git a/rhythm_game/note/view.gd.uid b/rhythm_game/note/view.gd.uid
new file mode 100644
index 0000000..61aefed
--- /dev/null
+++ b/rhythm_game/note/view.gd.uid
@@ -0,0 +1 @@
+uid://drrwatuw1yur
diff --git a/rhythm_game/note_layout.gd b/rhythm_game/note_layout.gd
deleted file mode 100644
index a33f0a0..0000000
--- a/rhythm_game/note_layout.gd
+++ /dev/null
@@ -1,84 +0,0 @@
-#TODO Split class into two.
-# One should be responsible for storing arrays of data, like a NoteData class?
-# Another represents a slice of the data, NoteView.
-# Before that, figure out how the part of a hold note between the hold start
-# and hold end will be implemented.
-class_name NoteLayout extends Node
-
-## Controls at what beat notes are visible.
-@export_group("Note View Offset")
-## At what beat offset from the current beat will notes will be visible.
-## Example, spawn = 4.0 means notes are spawned 4 beats before
-## they are meant to be hit.
-@export var spawn: float = 4.0
-
-## At what beat offset from the current beat will notes be invisible.
-## Example, despawn = 4.0 means notes are despawned 4 beats after
-## they are meant to be hit.
-@export var despawn: float = 4.0
-
-
-## The index in notes of the first active note.
-func start() -> int:
-	return _start
-
-
-## The index in notes after the last active note.
-func end() -> int:
-	return _end
-
-
-func size() -> int:
-	return _beat.size()
-
-
-func beat(index: int) -> float:
-	return _beat[index]
-
-
-func lane(index: int) -> int:
-	return _lane[index]
-
-
-func type(index: int) -> Note.TYPE:
-	return _type[index]
-
-
-# ======= IMPLEMENTATION ======== #
-
-# All notes in the chart, arranged by ascending beat.
-var _beat: Array[float] = []
-var _lane: Array[int] = []
-var _type: Array[Note.TYPE] = []
-
-var _start: int = 0
-var _end: int = 0
-
-
-func _push_note(_note: Note) -> void:
-	pass
-
-
-# TODO FIX THESE
-func _update_forward(new_beat: float) -> void:
-	var spawn_beat = new_beat + spawn
-	
-	while _end < size() and _beat[_end] <= spawn_beat:
-		_end += 1
-	
-	var despawn_beat = new_beat - despawn
-	
-	while _start < size() and _beat[_start] < despawn_beat:
-		_start += 1
-
-# TODO FIX THESE
-#func _update_backward(new_beat: float) -> void:
-	#var spawn_beat = new_beat + note_spawn_offset
-	#
-	#while _end >= 0 and _beat[_end] > spawn_beat:
-		#_end -= 1
-	#
-	#var despawn_beat = new_beat - note_despawn_offset
-	#
-	#while _start >= 0 and _beat[_start] < despawn_beat:
-		#_start -= 1
diff --git a/rhythm_game/note_layout.gd.uid b/rhythm_game/note_layout.gd.uid
deleted file mode 100644
index 9fa00b2..0000000
--- a/rhythm_game/note_layout.gd.uid
+++ /dev/null
@@ -1 +0,0 @@
-uid://dlnnbx2wvn66t
diff --git a/rhythm_game/rhythm_game.tscn b/rhythm_game/rhythm_game.tscn
index 9d485e8..2578998 100644
--- a/rhythm_game/rhythm_game.tscn
+++ b/rhythm_game/rhythm_game.tscn
@@ -1,6 +1,5 @@
-[gd_scene load_steps=10 format=3 uid="uid://dwro2d0482v0p"]
+[gd_scene load_steps=11 format=3 uid="uid://dwro2d0482v0p"]
 
-[ext_resource type="Script" uid="uid://dlnnbx2wvn66t" path="res://rhythm_game/note_layout.gd" id="1_cr5rn"]
 [ext_resource type="Script" uid="uid://102cl75cfpgw" path="res://rhythm_game/music_sync/event_layout.gd" id="1_jnfl3"]
 [ext_resource type="Script" uid="uid://s16dt0bu0jrg" path="res://rhythm_game/music_sync/conductor.gd" id="2_62aw1"]
 [ext_resource type="AudioStream" uid="uid://btmy8ffph5gn3" path="res://chart/test_nibelungen/audio.mp3" id="3_txi6k"]
@@ -8,6 +7,8 @@
 [ext_resource type="Script" uid="uid://rg6orh6kutai" path="res://resource_type/music.gd" id="5_nsyv8"]
 [ext_resource type="AudioStream" uid="uid://be8dyt7nfpffw" path="res://sfx/sfx_cowbell.ogg" id="6_ecbku"]
 [ext_resource type="Script" uid="uid://bbpyym0kgujev" path="res://rhythm_game/metronome.gd" id="7_nsyv8"]
+[ext_resource type="Script" uid="uid://8isyo4pxyj1r" path="res://rhythm_game/note/note_array.gd" id="9_10cpq"]
+[ext_resource type="Script" uid="uid://c7h7ue6kjgoha" path="res://rhythm_game/note/note_view.gd" id="9_74aio"]
 
 [sub_resource type="Resource" id="Resource_10cpq"]
 script = ExtResource("5_nsyv8")
@@ -25,13 +26,18 @@ autostart = true
 music = SubResource("Resource_10cpq")
 metadata/_custom_type_script = "uid://s16dt0bu0jrg"
 
-[node name="NoteLayout" type="Node" parent="."]
-script = ExtResource("1_cr5rn")
-metadata/_custom_type_script = "uid://dlnnbx2wvn66t"
-
 [node name="Metronome" type="AudioStreamPlayer" parent="."]
 stream = ExtResource("6_ecbku")
 script = ExtResource("7_nsyv8")
 metadata/_custom_type_script = "uid://bbpyym0kgujev"
 
+[node name="AllChartNotes" type="Node" parent="."]
+script = ExtResource("9_10cpq")
+metadata/_custom_type_script = "uid://8isyo4pxyj1r"
+
+[node name="VisibleNotes" type="Node" parent="." node_paths=PackedStringArray("notes")]
+script = ExtResource("9_74aio")
+notes = NodePath("../AllChartNotes")
+metadata/_custom_type_script = "uid://c7h7ue6kjgoha"
+
 [connection signal="ticked" from="Conductor" to="Metronome" method="on_conductor_ticked"]