Added volume bar and song list and refactored character select

volume_slider.gd

@@ -0,0 +1,15 @@
+extends HSlider
+
+@export
+var audio_bus_name := "music"
+
+@onready
+var _bus: int 
+
+func _ready():
+	_bus = AudioServer.get_bus_index(audio_bus_name)
+	value_changed.connect(_on_value_changed)
+	value = db_to_linear(AudioServer.get_bus_volume_db(_bus))
+
+func _on_value_changed(value: float) -> void:
+	AudioServer.set_bus_volume_db(_bus, linear_to_db(value))