Emmet Otter recording?

There's no soundtrack album that I know of -- which does not mean there was not a limited, private or non-U.S. release. However, the signature song, "Where the River Meets the Sea," was performed on the album, "John Denver and the Muppets: A Christmas Together," and it was sung by Denver and Jerry Nelson, who plays Robin on the record, but was Emmett in the TV special -- and the voices are similar. That's as close as I could get to the soundtrack on vinyl. It's also available on CD, here on amazon (make sure you get the one with all 13 tracks):