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In 1976, the ABA was concerned that the 9th Annual ABA All-Star Game (to be played at Denver's McNichols Arena) would not attract a full house.
To stir up interest in the game, the Denver Nuggets hired two 1970's music megastars -- Glen Campbell and Charlie Rich -- to stage a special pre-game concert. Here they are (Campbell above left and Rich above right), crooning away before the big game.
Apparently, the singers did help the gate -- 17,798 basketball (and music) fans showed up to witness the most memorable evening in ABA league history.
Michael Murphy Article About 1976 ABA All-Star Game