John Mayer’s ‘Shadow Days’ About Jennifer Aniston & More Break-Up Songs (Photos)RUMOR HAS ITJohn Mayer’s single ‘Shadow Days’ is about Jennifer Aniston, reports Us Weekly. See other breakup songs.The Daily BeastUpdated Jul. 14, 2017 8:14PM ET / Published Oct. 22, 2010 2:24PM ET Henny Ray Abrams / AP Photo ; Markus Schreiber / AP Photo