The Theatre of Eternal Music, sometimes later known as The Dream Syndicate, was a mid-sixties musical group formed by La Monte Young  that focused on experimental drone music. It featured the performances of La Monte Young, John Cale, Angus MacLise, Terry Jennings, Marian Zazeela, Tony Conrad, Billy Name,Jon Hassell, Alex Dea and others. The group is stylistically tied to the Neo-Dada aesthetics of Fluxus and the post-John Cage noise music continuum. Source: http://en.wikipedia.org/wiki/Theatre_of_Eternal_Music
Fluxus: a name taken from a Latin word meaning “to flow”—is an international network of artists, composers and designers noted for blending different artistic media and disciplines in the 1960s. They have been active in Neo-Dada noise music and visual art as well as literature, urban planning, architecture, and design. Fluxus is often described as intermedia, a term coined by Fluxus artist Dick Higgins in a famous 1966 essay.
Among its early associates were Joseph Beuys, Dick Higgins, Nam June Paik, Wolf Vostell, La Monte Young, Joseph Byrd, and Yoko Ono who explored media ranging from performance art to poetry to experimental music to film. They took the stance of opposition to the ideas of tradition and professionalism in the arts of their time, the Fluxus group shifted the emphasis from what an artist makes to the artist’s personality, actions, and opinions. Throughout the 1960s and 1970s (their most active period) they staged “action” events, engaged in politics and public speaking, and produced sculptural works featuring unconventional materials.
The Fluxus Manifesto:
Long Live the Fluxus