"He came back afterwards and introduced himself," Ken Casey told Rolling Stone. "We were just blown away, but we really hit it off. He's since invited us to play with him a few times." During their Working On A Dream Tour, Bruce Springsteen & The E Street Band played the TD Banknorth Garden in Boston, MA, on 22 Apr 2009. They were joined onstage by the Dropkick Murphys on Glory Days and American land. Then the band's guitarist, Tim Brennan, proposed onstage down on bended knee to his girlfriend Diana. Springsteen then dedicated the tour premiere of So young and in love
to the couple, saying that "this was going to be their wedding song." Springsteen appears on two Dropkick Murphys studio tracks: Peg O' My heart in 2011 and Rose Tattoo
in 2013. Ken Casey is a lifelong Springsteen fan, and his favorite Springsteen album is Darkness On The Edge Of Town. The Dropkick Murphys have covered Badlands
live and Casey has said that the band wouldn't say no to recording an entire album as Bruce Springsteen's backing band. "Bruce, we're ready when you are," Casey told Rolling Stone.