Sona should play custom background music similar to her dj sona skin
As the title says I think her skins like guqin, arcade, original, etc be able to play their own custom music. Her original would play demacian/ionian music, arcade: techno, etc. Sona is a unique champion but it isn't emphasized enough, She is a maven of the strings that inspires allies and having the background music be changed when she gets played in game will bring a fun experience to many supports who do not have her dj skin.