Conversation so far:
What was psychedelia?
Psychedelia refers to psychedelic art, psychedelic music and the subculture that originated in psychedelic experiences of the 1960s, by people who used psychedelic drugs such as LSD, mescaline and psilocybin.
What was krautrock?
Krautrock is a genre of rock that developed in Germany in the 1960s and 1970s among bands that blended elements of psychedelic rock, electronic music, and various avant-garde influences.

Question: What was special about their origins?
Self-contained rewrite: What was special about Tangerine Dream's origins?