Something that kinda came into my head.
Since he was a character in his own right (to an extent), it would have been cool if Big Jeffy of the Monotones/Alphabeats got to perform his own song.
Ignoring the fact that the puppet was used as the lead hippie in the song "The Garden" (since none of the characters had names or the group name in season 2, and the dubs make it clear Moss isn't even voicing the character in that song), it would have been really cool hearing him sing his own song with Moss' smooth bass voice.