It has to be Apostle for me.
That was the song (well, the first 30 seconds or so..) that prompted me to try and track down the band and get 'em signed to the label. No one knew who they were at the time.
The song was a rehearsal track on a compilation cassette that Samoth made for me. It made up the last seconds of side B before the tape ran out. He could only tell me that Jonas from katatonia sent it too him, and he had no other info.
I then sent out flyers and messages to everyone I knew in Sweden before I finally got a call from Mikeal about 2 months later. It's weird, but even though I'd heard less than a minute of a track, I was instantly hooked. Tracking the band down almost became an obsession, but I'm really glad I got there in the end.
By the way, since the contracts are now signed, I can announce that the first signing to my new label Elitist will be Italy's Ephel Duath. They play a maddening and complex style of Black Metal, with excellent musicianship and great programming. Fans of Arcturus, or even bands like Dillinger Escape Plan should dig 'em.
Check out a track at: http://artists.mp3s.com/artist_song/654/654854.html