There are multiple artists with the name Mountain.
These are videos from concerts where Mountain played, so they may be of other bands that played the concert as well.
Mountain / Mylon / David Rea Dec 30 - 31, 1970 New York, New York, United States Added by Zimtrim
Mountain / Allman Brothers Band / Glory River Jul 10, 1970 Stony Brook, New York, United States Added by Concert Archives 3