Asmus Tietchens (born 1947, Hamburg), who also records under the monikers Hematic Sunsets and Club of Rome, is a German composer of avant-garde music. Tietchens became interested in experimental music and musique concrete as a child, and began recording sound experiments in 1965 with electronic musical instruments, synthesizers and tape loops.  His early recordings feature more accessible synthesized music, but beginning with Formen Letzer Hausmusik, his 1984 release for Nurse With Wound's label United Dairies, he began moving toward more abstract sound collages. He has taught acoustics in Hamburg since 1990.