Somebody give me a cookie! I'm posting twice in 24 hours!
Tighten Up was the 1968 hit by Archie Bell and the Drells, and I seriously would never have known this or cared had this cover of the original not come as a bonus track on some new edition of R.E.M.'s Reckoning. It's ridiculous and very '60s and is a song that generally makes me want to get up and prance around.
mp3: R.E.M. - Tighten Up