iPhone music library missing after iOS upgrade
I recently loaded a lot of music onto my iPhone from iTunes. Afterwards I did an iOS upgrade 11.2.1. After the upgrade I went into the music app and the library was empty. On further investigation I discovered that iTunes was reporting my "Other" storage at around 22GB. So, it would appear that the music is still there taking up a ton of space, but the Music app has lost track of all of it. Attempts to remove with iTunes (by unselecting all the music it thought the phone had and "sync"ing) has not helped. Things like rebooting and toggling settings in the music app have also not helped.
Is there a way to fix this without doing a factory reset? Any help appreciated.
iPhone 6s, iOS 11.2.1