"1, 2, 3, 4 (Sumpin' New)" is a rap song performed on episode 205 of Muppets Tonight. It is performed by Coolio, Seymour, Pepe the King Prawn, Clifford, Gonzo, and Rizzo the Rat. Bobo the Bear participates in the number, but doesn't actually sing during it. Other participates include Andy and Randy Pig and Nigel who dance in the background.
The number occurs when the group has to prove to Ernst Stavros Grouper that the Muppets are hip. As Coolio points out, "hip is not what you do, it's how you do it."
The song is changed somewhat from the original to include lines such as "let a Muppet know," and a rap version of Seymour and Pepe's song that originated in episode 107 during their comedy act. This is one of their song's numerous incarnations.