At the beginning of the game you get to name your band, and then you choose the dificulty setting, what sort of music your band likes e.g. punk, rock or pop. Then you can choose what outfits you would like to wear, makeup hair etc then basically choose your instrument, and tap on the touch screen in time to the music, and wait until you can unlock more places to play. It's very repetive, but I have found that I enjoy it most when I don't play for too long, and only picking now and again, so not good for keeping children entertained for hours on end, but perhaps because I am 15 I would think this, and perhaps it would keep them happy for a long time.
I love the imagine series, their ideas are very good and graphics etc but they do need to be longer games, and this one can easily be completed, but I just can't be bothered too. I own nearly all the imagine series, and this one is not in the top three, my top three, Imagine doctor, teachr and boutique owner, but that is just my personal opinion, worst? wedding planner, but try the game, you may like it and you can always trade it in if you don't.