Which female backing vocal group sang on Bob Marley's 1974 album 'Natty Dread'?

The female backing vocal group on Bob Marley's 1974 album Natty Dread was The I Threes.

The trio consisted of Rita Marley, Judy Mowatt and Marcia Griffiths. They became Bob Marley and the Wailers' signature backing singers after Peter Tosh and Bunny Wailer left the group. Their close harmonies helped define the band's sound during its international breakthrough.

Natty Dread was released on 25 October 1974 and was the first Bob Marley and the Wailers album recorded without Tosh and Bunny Wailer. It includes “No Woman, No Cry,” “Lively Up Yourself” and “Rebel Music (3 O'Clock Roadblock).”

A common mix-up is confusing The I Threes with The Wailers: The Wailers was the broader band name, while The I Threes specifically identified the female vocal trio. The Soulettes was an earlier Jamaican vocal group associated with Rita Marley, and The Melody Makers was the later family group formed by several of Bob and Rita Marley's children.