To Apple - at the very least, you could have warned us to be near our computer before doing this upgrade in case we have to reload our songs and playlists on the iPhone.
I store background tracks for my vocalist on my iPhone to play through the sound system during our performances. I did the upgrade to the iPhone 6 on Sunday, after a performance, in case there were problems. None. Last night at rehearsal, no problems. Today at performance, all the background tracks are gone. In front of an audience. Gone. Thank goodness the piano still worked or we would have had to cancel. However, since we practice with background tracks, it wasn't a very good performance.
The lack of responsibility to the impact of this by Apple is really concerning. Maybe they think music is just something nice to have. True, but what about employment? If this performance was an audition ... well, we wouldn't have a chance. If we don't get another booking from this client, it's a big deal. I've been reading other posts - losing your entire library that you recorded from vinyl! That's a lot of time to do over. Beyond frustrating. Next phone will be an Android.