Metal Machine Music (subtitled *The Amine β Ring) is the fifth studio album by American rock musician Lou Reed. It was recorded on a three-speed Uher machine and was mastered/engineered by Bob Ludwig. It was released as a double album in July 1975 by RCA Records, but taken off the market three weeks later. A radical departure from the rest of his catalog, Metal Machine Music features no songs or recognizably structured compositions, eschewing melody and rhythm for modulated feedback and noise music guitar effects, mixed at varying speeds by Reed. Also in 1975, RCA released a Quadrophonic version of the Metal Machine Music recording that was produced by playing it back both forward and backward, and by flipping the tape over.
The album cost Reed his reputation in the music industry and has generally been panned by critics since its release. Simultaneously, it opened the door for some of his later, more experimental material. In 2008, Reed, Ulrich Krieger, and Sarth Calhoun collaborated to tour playing free improvisation inspired by the album as Metal Machine Trio. In 2011, Reed released a remastered version of Metal Machine Music.
