[Bug 705999] taglist: handle publisher, interpreted-by and key tags

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=705999
  GStreamer | gstreamer (core) | git

--- Comment #20 from Matthieu Bouron <matthieu.bouron at collabora.com> 2013-08-19 10:17:05 UTC ---
The documentation specify it is the key at which the sound starts however in
pratice it can be the main key of the whole song (I personnaly use it as the
main key of the song since it helps harmonic mixing of two songs).

I guess some comparaison should be made on different samples to figure how
people use this tag. Unfortunately I have no "harmonic ears" so it could take
some time.

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