There are 2 artists named Yok: #1. A Japanese folk singer http://www.myspace.com/yok123smile
#2. Yörg (Yog [- Quetschenpaua]) was born 1962 in Itzehoe (Germany). His musician biography starts in the early anti nuclear movement.
Blumfeld was a German indie-pop band and one of the most important bands of the 'Hamburger Schule'. It was founded in 1990 They had their first success with the album 'Ich-Maschine' in 1992, which was one of the first albums becoming popular that had German lyrics after many years of mostly English lyrics in German pop history (similar to the events back in the days of the "Neue Deutsche Welle").