Soft Cell - "Tainted love" - 1981
A version of this song I am particular fond of is the 9 minutes/Super 45 RPM version of "Tainted love". This extended dance version (one of the first dance version I can recall) was a medley, transitioning to a cover of The Supremes' "Where Did Our Love Go" half-way through the song.
I don't like too much the "Tainted love" video, so for a change here is just the music track of the extended dance version:
