Before you start waving your arms to put the brakes on this wacky-on-paper idea, bear in mind we're not advocating an evening of ''Macarena,'' ''Mambo No. 5,'' ''Mickey,'' and ''Cotton-Eyed Joe.'' Nope, instead imagine the loooong list of terrific tunes recorded by artists who, for whatever reason, only struck chart gold on one occasion. We'll get the brainstorm session started, and you can keep it going down in the comments section: a-ha's ''Take on Me,'' Deee-Lite's ''Groove Is in the Heart,'' Edie Brickell & New Bohemians' ''What I Am,'' Cutting Crew's ''I Just Died in Your Arms,'' Dead or Alive's ''You Spin Me Round (Like a Record)''...your turn! (See how fun this would be!)