Bjørn Lynne, also known as "Dr.Awesome/Crusaders", made a lot of music for the Crusaders demos and music-disks. He released many soundtrack CDs, including one with the music he made for the Team17 Amiga game "Alien Breed 3D" from 1995. Check out Bjørn's homepage.
Amiga Music Preservation
(AMP), a non profit association, is running the biggest and
most comprehensive database ever about amiga music and amiga
musicians. All the composers of the amiga deserve to be remembered
and to have their work preserved. We tried all we could on our own
but although it's growing all the time, now we seriously need you
to help us one way or another.
Netzreport has written a small article about websites that offer
old Amiga games ready for emulators legally and free of