Sounds a bit of a weird one… if you removed all your original mp3 files off your pc the tunes in your itunes wouldn't play? so they must be somewhere else on your system? unless there now not playing?
You should cantact Specialized about it, I have a freind who has the same frame and Specialized told him that if he doesnt fit Specialized parts they will not warranty his frame at all for any reason.
??? will not warranty his frame ??? Its not a specialized part… BB91 is a shimano bb
Welcome to the rat race… Had the same experience when I first started commuting through London 😉 Still wear a helmet mind as the pedestrian are dangerous!