Colbie Caillat and Common seem like an unlikely pairing, but some things just work. The pop singer enlists the Chi-town MC for “Favorite Song,” a breezy cut off her new album All of Me, arriving Tuesday. Common, who will release his new album The Dreamer, The Believer on Warner Bros. Records this fall, gets quite a bit of shine on the feel-good Ryan Tedder production. Add this to your summer playlist.