42. "Square One"
First heard on the soundtrack to Cameron Crowe's 2005 film Elizabethtown, "Square One" received a proper release a year later on Petty's criminally underrated solo LP Highway Companion. Co-produced by Jeff Lynne and Mike Campbell, the album exudes contentment and hard-won satisfaction. "It took a world of trouble, took a world of tears," Petty sings gently. "It took a long time to get back here." "I am pretty happy these days," the 55-year-old singer said at the time. "I've gotten through the dark tunnel and come out the other side."