Moby Grape is an American rock band founded in 1966. Part of San Francisco's psychedelic music scene, the band merged elements of rock and roll, folk music, pop, blues, and country. They were one of the few groups of which all members were lead vocalists and songwriters. The group's first incarnation ended in 1969, in part due to members Bob Mosley and Skip Spence suffering from mental illness. The group has reformed many times afterwards and continues to perform occasionally.

James Robert "Bob" Mosley is principally known as the bass player and one of the songwriters and vocalists for the band Moby Grape. Some of his best-known songs with Moby Grape are "Mr. Blues", "Come In The Morning", and "Lazy Me" from the first Moby Grape album (1967), and "Gypsy Wedding" from the 20 Granite Creek (1971) album.