it would be nice if we would get a musical book from the gem store which would be updated with new songs from time to time by A-Net because not all the players are musical talents to compose songs but they would like to look more professional instrument players
Something like Guitar Hero
Here is how other MMOs have implemented this and even transformed it into a mini game with levels.
or
https://www.youtube.com/watch?v=KelpRPbe6SM