Mother, her 1979 solo album, led to Smyth founding Mother Gong having left the original Gong band in 1975 to have children.

Mother Gong toured internationally in 1979-1981 and 1989-1991, either headlining or supporting such artists as Bob Dylan and Big Brother and the Holding Company. Smyth appeared as a solo performer and lecturer at the Starwood Festival in the early 1990s. She has also done voice-overs for commercials, taped children's books and other books and poetry, given workshops on voice projection and voice as a confidence raiser, and has performed for many women's groups.