Izquierda

"One of the earliest albums with a lesbian presence by a group came out in 1978, and the name of their 1979 album was "Quiet Thunder." The name of the group was Izquierda, which in Spanish means left. Lead vocals were by Naomi Littlebear Martinez, later known as Naomi Littlebear Morena. She's been a respected writer, speaker, songwriter and social activist for decades." (posted on Queer Music Heritage site)

Izquierda Ensemble toured on a national feminist circuit for at least four years. 

Discography of Quiet Thunder: https://www.discogs.com/release/3232336-Izquierda-Ensemble-Quiet-Thunder