Using C#
Problem:

code:
Any quick ways to make the sliders independent of the the label size
You can use
GUI.skin.horizontalSlider.fixedWidth = someValue;
or (not tested)
GUILayout.BeginHorizontal();
GUILayout.Label("Music:" + Mathf.RoundToInt(MusicVolume));
GUILayout.FlexibleSpace();
MusicVolume = GUILayout.HorizontalSlider(MusicVolume, 0, 100, GUILayout.Width(someValue));
GUILayout.EndHorizontal();