I was listening to an online radio station for some holiday music and a song from this album came up. I was very amazed to discover they made a Christmas album, let alone got all the cast to participate. I haven't even found a Wikipedia page for it yet, but on Lorne Greene's wiki page it is listed under his discography from 1963 and was produced by RCA.
Amazing. My parents watched Bonanza growing up and they introduced it to me it many years ago. Not exactly my kinda show but it does have its moments.