I had this idea. Press D and J to play the guitar. No music because i didn't found any. It's mainly a concept.
Basically you would hit the notes like a Taiko no Tatsujin thing(crap mechanic now that i think of it.) But if you have a better thing for the gameplay, please tell me! I just think the loading screen is fine. Nobody is shown tuning guitars in other games, right? :D