Update sources from command line?

[DRONE7]

Code:

# Specify the method to use to retrieve the track information,
# the alternative is to specify 'musicbrainz':
CDDBMETHOD=cddb

You can try both for each lookup....

Code:

# Specify the method to use to retrieve the track information,
# the alternative is to specify 'musicbrainz':
CDDBMETHOD=cddb,musicbrainz

 if it is not found on the first it tries the second  and, yes, popular music is much better tagged and found as it is, surprise, popular (= more submitters and possibly listeners to classical are less inclined to rip ??  ripping for mobile environments being not so successful a use case  ;-)