Cannot delete songs from iPhone

On my iPhone I see a list of songs I cannot delete. Here's what I tried:

• Go to settings -> memory usage -> iTunes -> delete all music


• Disable iTunes Match


• Disable show all music


• Connect to iTunes on the Mac and manually remove all synced songs


• Swipe to delete does not work


• The songs do not show any sort if cloud icons

iTunes shows 3.3GB of Audio on my device which I cannot get rid of.

Any other ideas what to try?