I just use this tag to persuade the lasfm machinery to play tracks which I have only heard once. http://www.last.fm/user/headey/library/tags?tag=--1 .
If you'd like to use the same idea could you add your initials to the tag maybe? Then we won't get mixed up.
(I didn't use mine because when I started the tag it was at the time that lastfm let each person play their personal tags.)
Cheers
FH
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