"Fall on Me," the duet between vocalist supreme Andrea Bocelli and son Matteo, is gaining some serious traction. The song, written by Ian Axel and Chad King of A Great Big World, is currently #37 at iTunes, while the Bocellis' EP, also called Fall on Me (Decca) is #14 on the album chart. "Fall" will appear on the ST for the Disney holiday-season blockbuster The Nutcracker and the Four Realms (out 11/2), but the clip below is a moving musical dialogue between father and son.