This app was mentioned in 3 comments, with an average of 1.00 upvote
It's this
OOC: it is an honest to god thing
IC:
She's now tapping away on her screen, playing the game.
https://play.google.com/store/apps/details?id=kr.co.dalcomsoft.superstar.a&hl=en
its really good for a mobile rhythm game