.........that you have ever heard? In other words (because I'm probably not using the proper terms), what was the best tune that you have heard from a DJ, producer, or whatever that wasn't published or sold? It can be more than one tune.
For me, it was a remix of "Obsession" by Future Cut mixed by DJ Starchild back in 2002. This is the first song off of the Goldie.co.uk album. When I heard the Starchild remix I was happy because I knew I had the song on CD. To my disappointment, the original wasn't as good as the remix. I couldn't find it in any record store either.