For whoever that might stumble upon this post using Google or the search function of the forum:
I settled for the following solution, suggested by Redwing (and with some details from MTOakey) in this post:
https://getmusicbee.com/forum/index.php?topic=21100.0- create a silence file of 10 sec
- tag it with album artist and album name (as for all the other tracks in the folder, so in my exemple: 'Elvis Presley' and 'Greatest Hits')
- make sure it's first in line
- ban it from playing (Edit/Settings/Exclude from playback - full ban)
- embed album art ('Greatest Hits')
- all other tracks: embed 'single art' (with 'Embedded' first in line in Edit/Edit preferences/Tags (1)-artwork storage-set which pictures are displayed)
- tracks that don't have single art will show album art, coz I have Cover.* as second in line in above mentioned setting, and a picture of 'Greatest Hits' (named cover.jpg) in the album folder; this way, when I embed a single cover, this will immediately overrule the album cover
Easy ;-)
b.