Instrumental (5) and Vocals (6) overlapped with Title|MP3 and Artist|MP3 in the [Flags] enum. A song file with #INSTRUMENTAL or #VOCALS therefore passed the mandatory-tag checks even when #TITLE, #ARTIST or #MP3 were missing, leaving Audio empty. Give each flag its own bit (Instrumental = 64, Vocals = 128). Co-authored-by: Florian Ostertag <flokuep@users.noreply.github.com>