Trout Mask Replica is the third studio album by the American band Captain Beefheart and his Magic Band, released as a double album on June 16, 1969, by Straight Records. The music was composed by Captain Beefheart and arranged by drummer John "Drumbo" French. Combining elements of R&B, garage rock, and blues with free jazz and avant-garde composition, the album is regarded as an important work of experimental rock. Its unconventional musical style, which includes polyrhythm, multi-octave vocals, and polytonality, has given the album a reputation as one of the most challenging recordings in the 20th century musical canon.

Don Van Vliet was an American singer, songwriter, multi-instrumentalist, and visual artist best known by the stage name Captain Beefheart. Conducting a rotating ensemble known as the Magic Band, he recorded 13 studio albums between 1967 and 1982. His music blended elements of blues, free jazz, rock, and avant-garde composition with idiosyncratic rhythms, absurdist wordplay, a gravelly voice, and a wide vocal range. Known for his enigmatic persona, Beefheart frequently constructed myths about his life and was known to exercise an almost dictatorial control over his supporting musicians. Although he achieved little commercial success, he sustained a cult following as an influence on an array of experimental rock and punk-era artists.