add PERFORMER, DISCID and CONTACT field names. clarify the (overloaded) role of ARTIST. clarify that COPYRIGHT included license info.
add PERFORMER, DISCID and CONTACT field names.
clarify the (overloaded) role of ARTIST.
clarify that COPYRIGHT included license info.

in response to the recent thread by Jonathan Walther.


git-svn-id: 03f0f1727258f1959b7b485b30a676bafdb78148@2111 0101bb08-14d6-0310-b084-bc0e0c8e3800

fcoulombe/vorbis,fcoulombe/vorbis,fcoulombe/vorbis,fcoulombe/vorbis,soundcloud/vorbis,soundcloud/vorbis,soundcloud/vorbis