The Frogtown Hollow Jubilee Jug-Band
From the 1977 Muppet TV special Emmett Otter's Jug-Band Christmas. Based on a children's book of the same name by Lillian Hoban, it stars none of the Muppet regulars except Kermit, who only narrates the tale.
Poverty-stricken Emmet Otter forms this band with his pals to play Waterville's First Annual Christmas Talent Contest. They rehearse the song "Barbecue," but when that idiot Yancy Woodchuck plays it in the competition before they do, they quickly rehearse up another song, "Brothers."
They don't win the competition (see The Nightmare), but dammit they had heart! And they did get a paying gig singing at the Riverside Rest restaurant owned by Doc Bullfrog (not Kermit, he just narrated).
This semi-otter band featured Emmet Otter (Jerry Nelson) on washtub bass, Harvey (Jim Henson) the muskrat on kazoo and washboard, and Wendel (voiced by Dave Goelz) the porcupine on jug, and Charlie the otter on cigar box banjo. Emmet's mother, Alice Otter also performed at the contest.
Composer Paul Williams wrote the songs.