Link to Releases:
https://musicbrainz.org/release-group/b34f912d-23ad-3b7c-ac06-b24dd425f721

The "River North Records" album can't be loaded for tagging and prevents automatic loading into picard. Manually loading an other variant does work (thereby my problem is solved), but maybe there is a problem in the data.

Traceback (most recent call last):
File "/usr/lib/picard/picard/webservice.py", line 245, in _process_reply
handler(str(reply.readAll()), reply, error)
File "/usr/lib/picard/picard/coverart.py", line 112, in _coverart_downloaded
_walk_try_list(album, metadata, release, try_list)
File "/usr/lib/picard/picard/coverart.py", line 242, in _walk_try_list
album._finalize_loading(None)
File "/usr/lib/picard/picard/album.py", line 201, in _finalize_loading
for track_node in medium_node.track_list[0].track:
File "/usr/lib/picard/picard/webservice.py", line 77, in _getattr_
raise AttributeError, name
AttributeError: track

HTH.