Digimon: Digital Monsters
The Dancing Digimon
S1 E11:
After suffering an attack from Ogremon at sea, Joe and Gomamon find themselves on an island with Sora and Biyomon. They are captured by a band of Bakemon intent on eating them. Gomamon and Biyomon manage to escape and digivolve to fight the Lord Bakemon. They eventually defeat him with help from Joe's repetitive chanting.