Heh, found it myself, when I was digging throught some posts at this forum. (here: web.archive.org/web/20000312132144/www.jazz2city.com/music.htm)

I throw in another question here, even if it's a bit off-topic : In the music-pack with the music from Jazz 1, there's a file called SECRET.S3M. Where is this piece of music used in the game (if it's used at all...).