In the 1970s, Sven Grünberg was the leader of the progressive rock band Mess, which was founded by him in January 1974 together with Härmo Härm. Despite the years of the band's existence and many live performances, Mess didn't release a sing studio album because of the contradictions of the musical style with the Soviet ideology: only in 1996 Grünberg released a compilation from several survived Mess recordings and a full remastered album in 2004.
Sven Grünberg is also the Chairman of the Board of the Estonian Institute of Buddhism. - Discogs'
Thanks to Ork Wurzel for this gem!