Listen to S.I.M.P. (Squirrels in My Pants) online. S.I.M.P. (Squirrels in My Pants) is an English language song and is sung by Little Apple Band. S.I.M.P. (Squirrels in My Pants), from the album The 50 Best Kids Songs from Sesame Street, The Muppets, Phineas and Ferb, Fraggle Rock and More!, was released in the year 2013. The duration of the song is 1:35. Download English songs online from JioSaavn.