Sour Note has a muscular body similar to Squidward's "handsome" body in the episode "The Two Faces of Squidward." He has matching piano leather gloves and boots and a mask with eight notes on each side.
He has a clarinet that he can summon, which takes its appearance from a clarinet in real life.
He first uses his clarinet as a full-scale attack on Burger-Beard, who resists the loud music. Later, during the chase, he uses it in a last-ditch attempt to keep the book away from Burger-Beard before collapsing in exhaustion.
He does not appear until after Plank-Ton saves the gang and retrieves the formula. Squidward wishes to stay in this form forever, but SpongeBob returns everything to normal via the Magic Book, although allowing Squidward to keep his "rock-hard abs."
Sour Note can summon a clarinet that is able to play really loud music.
Unlike actual Squidward, Sour Note only has two feet and legs instead of four.