14. "Walls (Circus)"
Ed Burns was one of the hottest filmmakers around when he approached Petty about contributing songs for his movie She's the One. The best of the bunch, "Walls," was inspired by something Petty had been told by Johnny Cash. "He said to me, 'Some days are diamonds, and some days are rocks.' I took that line and wrote the song." Lindsey Buckingham helped arrange its lush harmonies, resulting in one of Petty's prettiest songs. But two different versions appeared in the film, hurting its chances of becoming a single. "It probably should have been a hit," says Petty.