"Mary Had a Little Lamb" is an English language nursery rhyme of nineteenth-century American origin. It was heard in the Season Twelve episode, "Pandemic". The song is performed as an instrumental.
Background[]
When Eric Cartman notices all the Peruvian Pan Flute Music bands making money at the local mall, he convinces Stan Marsh, Kenny McCormick, and Kyle Broflovski to form a band of their own. The boys con Craig Tucker into using his $100 birthday money so they can afford the costumes and instruments. The band are mistaken for real Peruvian street musicians and deported back to Peru with the other bands.