Bruce Springsteen‘s unreleased song vault is a source of seemingly infinite wonders. “Lonely Night In the Park” was recorded at New York’s Record Plant across two days in May 1975, and came very close to appearing on Born to Run. (Van Zandt didn’t join the E Street Band until the Born to Run tour, and Aniello didn’t enter Springsteen’s orbit until the 2000s.) The 30th anniversary of Born to Run in 2005 was celebrated with a new box set and documentary. If all of this doesn’t fulfill your Born to Run 50 needs, Peter Ames Carlin — author of the definitive Springsteen biography Bruce — has just released Tonight in Jungleland: The Making of Born to Run.