Consider visiting the Asylum Choir.
Don't let the name fool you: the Choir consisted of a duo on its first album. Additional musicians appeared on its second, final release, but the assembled multitude never added up to a full choir, not even through the then-limited art of multitracking. In whatever form, the band probably never played in an asylum either.
The duo consisted of Marc Benno, who sang and played guitar and bass, and Leon Russell, who sang and played guitar, piano, and drums. Benno hailed from Texas, Russell from Oklahoma. They met in LA, where Russell enjoyed an active career as a session musician, from early-'60s work with Phil Spector to mid-'60s work as a member of the so-called Wrecking Crew. Gatefold and record are great