I actually worked on an iPad app when I was in school that does this: https://github.com/benweitzman/retune https://github.com/benweitzman/retune (please excuse

I actually worked on an iPad app when I was in school that does this: https://github.com/benweitzman/retune https://github.com/benweitzman/retune (please excuse the terrible code/project layout, I was just learning iOS at the time)