Metal Machine Music, subtitled *The Amine β Ring, is the fifth solo album by American rock musicianLou Reed. It was originally released as a double album byRCA Records in 1975. A departure from the rest of Reed's catalog, Metal Machine Music is variously considered to be a joke, a grudging fulfillment of a contractual obligation, or an early example of noise music. The album features no songs or even recognizably structured compositions, eschewing melody and rhythm for an hour of modulated feedback and guitar effects, mixed at varying speeds by Reed. In the album's liner notes he claimed to have invented heavy metal and asserted that Metal Machine Music was the ultimate conclusion of that genre. The album cost Reed credibility in the music industry while simultaneously opening the door for some of his later, more experimental material. Historically, Metal Machine Music is considered a forerunner of industrial music, noise rock, and contemporary sound art.