SoundTracker

Probably the first really well-known tracker ever, was the Ultimate SoundTracker made by the german software developer Karsten Obarski in 1987 for the Amiga. In the beginning SoundTracker was a commercial product, but was later on turned into public domain (which was the closest you had to open source back then.) Its popularity went up, and many clones with similar names were releases were created and used across the Amiga demo scene.

SoundTracker offered four tracks of audio (a limitation of the sound chip) handling up to 16 different samples in a song. An official floppy disk called "ST-01" was one of the most popular sample collections available, featuring a set of audio files in the IFF 8SVX format, most in 8 or 16 KHz sample rate, and all in 8-bits per sample - another limitation of the Amiga sound chip.