The systems are quite a bit differant twix the bodies I am well aware of Brian.
I visited BMI and couldn't fine anywhere i could check as a non mewmber so can't comment on them, but I did E-mail the NY office advising of this post and giving them a rough outline of the content, asking for either a visit, or their thoughts.
ASCAP bore more fruit.
The link below has the live performance thing on it. Even the formular how it is figured and maintained.
http://entertainment.howstuffworks.com/music-royalties7.htm
I am pretty sure that indicates there is in fact a play list system in force up there.
Fair bit of reading in the link guys, and covers all areas.
Graham

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http://www.soundclick.com/bands/2/grahamhendersonmusic.htm