...embed lyrics in music file.
However the problem seems to be that MB syncs its tags with the files updated by MediaMonkey and the other way round. I wanted to force both programmes to accept each other's unsynced lyrics but seem to have achieved the opposite: each programme erased the lyrics of the other programme.
D**n.
Now I can have the programme scan again, I have only tagged A, B and C music so far but each letter took me three hours no matter what programme I used.
Music Bee 3; EAC; MP3Tag; Music on Synology NAS 115; Logitech Media Server on RPI 3; RPI 2 with Hifiberry; Poweramp for Android/Lineage