Reissue of Frank Zappa's second solo album. Five of the six songs are instrumental ("Willie the Pimp" features a short vocal by Captain Beefheart). It was Zappa's first recording project after the dissolution of the original Mothers of Invention. In his original sleeve notes Zappa described the album as "a movie for your ears." This was the first Frank Zappa album recorded on 16-track equipment and one of the first albums to use this technology. Machines with 16 individual tracks allow for much more flexibility in multi-tracking and overdubbing than the professional 4- and 8-track reel-to-reel tape recorders that were standard in 1969.