From Discogs.com : "A duo of Bernd Kastner and Siegfried Michail Syniug, Strafe Für Rebellion ("Punishment For Rebellion" - later known as Strafe F.R.) started in 1979. Over the course of several albums, they developed a personal style of abstract instrumental music that owed a lot to their use of home-made instruments, found objects and field recordings. They dissolved quietly in the mid 90s, after releasing the "Pianoguitar" album."
"Vögel" was released by Touch Records in 1989.
Get it here : Strafe Für Rebellion - Vögel