A Christmas Together is the soundtrack of a 1979 television Christmas special starring the late, great John Denver along with the cast of The Muppets, the brainchild of the late, great Jim Henson.
There are lots of fun little songs on this album, from holiday classics performed by the whole cast ("The Twelve Days of Christmas", "Deck The Halls"), to original songs written specifically for this TV special ("When The River Meets The Sea"). The in-house band, Dr. Teeth and the Electric Mayhem, do their take on "Little Saint Nick", a Christmas song originally performed by The Beach Boys.
Getting the original video can be difficult, since it has never been "officially" issued on DVD or even VHS, however it appears some people who had the foresight to record this (and actually HAD a VCR in 1979, relatively few did) are now offering "bootleg" DVD copies for sale. I wouldn't wanna rat anyone out, but they're around.