What makes Affenstunde by Popol Vuh notable?

Affenstunde is notable for its influence on the development of ambient and electronic music, showcasing a seamless integration of classical instrumentation with avant-garde techniques. The album has been highly regarded in retrospective reviews, often cited as a foundational work that inspired subsequent generations of musicians exploring experimental soundscapes. Affenstunde is Popol Vuh's second album, released in 1970, following their debut album, Hosianna Mantra. At this point in their career, the band was solidifying their unique fusion of electronic music and spiritual themes, establishing themselves as pioneers within the Krautrock movement.