* Autotag
** The Objective
+ Given a list of files, a album name and/or an artist name, find the
  most apropiate release and apply its tags to the files.

** The Problems
+ musicbrainz stores a lot of metadata for each release
+ the structure of the metadata is not clear
+ metadata is not always available

** Implementation
+ autotag searches for all releases with a given name and prompts the
  user to select one using dmenu. The id is kept.
+ the relevant release is looked up using the kept id. We do this in
  order to include extra metadata that is not included in a mb-search
+ The metadata relevant to the whole release is kept while the
  metadata for each track is retreived
+ The metadata is joined together.
+ Metadata is applied to the song files, the user is prompted each
  time a unambiguous selection cannot be made.

** FIXME
+ Check for musicbrainz errors
** Ideas
+ add tag stack to reuse tags, usefull for manual tagging
+ manually give autotag a release id, might be useful later
+ add -f 'artist,album,track, ...' to control tags, implement more tags
+ export tags to stdout instead of just writing them
+ write scripts