If you are into this type of music, I highly recommend you take a listen to this rare out-take.
https://www.youtube.com/watch?v=9_GYW_NGlME
“Mountain Song (v4) / Wall Song”
Recorded Circa 1971
Rehearsal Personnel
David Crosby – guitar, vocals
Graham Nash – guitar, vocals
Paul Kantner – guitar, banjo, vocals
Grace Slick – piano, vocals
Jorma Kaukonen – lead guitar
Jack Casady – bass
Jerry Garcia – guitar, vocals
Phil Lesh – bass
Bill Kreutzmann – drums
Mickey Hart – percussion
David Freiberg – viola, vocals