For me it's Blue Monday.
Apart from buying it at the time, it's appeared on New order compilations, remixes, 80's compilations and electronic/alternative compilations.
I have it so many times, I can,t even be bothered to try counting.
It's rare that a compilation of the period doesn't contain it.
It's a tribute to the genius of the track that I still don't get bored listening to it.
It's followed closely for me by Fools Gold by the Stone Roses: another mainstay of Alternative compilations.
