Anthem of the Sun is the second album by rock band the Grateful Dead, released in 1968 on Warner Bros/Seven Arts. It is the first album to feature second drummer Mickey Hart. The band was also joined by Tom Constanten, who contributed avant-garde instrumental and studio techniques influenced by composers John Cage and Karlheinz Stockhausen. The album was assembled through a collage-like editing approach helmed by members Jerry Garcia and Phil Lesh, in which disparate studio and live performance tapes were spliced together to create new hybrid recordings. The band also supplemented their performances with instruments such as prepared piano, kazoo, harpsichord, timpani, trumpet, and güiro. The result is an experimental studio amalgam that is neither a pure studio album nor a live album.

Philip Chapman Lesh is an American musician and a founding member of the Grateful Dead, with whom he played bass guitar throughout their 30-year career.