 Olson has written or co-written over three hundred songs for Phineas and Ferb (Disney), as well as eight songs for Disney's TV film and four songs for the Disney+ film .Olson and his friend director Bobcat Goldthwait also co-wrote the theme song for "Don't Watch This Show" (Cinemax).At Disney Studios, with songwriting partners Dan Povenmire and Swampy Marsh, Olson co-wrote songs with Bobby Lopez, co-writer of Broadway's "The Book of Mormon" and Disney's "Frozen."