Bruce Springsteen contributes guest vocals to 'Summer Soldier (Holler If Ya Hear Me),' a track by singer-songwriter Stewart Francke that deals with an American soldier's experiences in the war in Afghanistan. The song appears on Francke's upcoming album, 'Heartless World.'

Springsteen's voice can be heard echoing Francke's lines in the chorus of the rootsy rock song. "This is a tremendously cool thing for Bruce to do, and of course a great honor for me," Francke says in a press release. "It was always his voice I heard on the call and response part of this track, but figured it would remain just a wish."

Francke goes on to explain how the collaboration came about. "Bruce had said some kind words about my music in the past, and we’ve said hello on a couple occasions, so I sent the song along to him through his management," explains Francke. "He found something in it compelling enough to join me, and I’m still a bit knocked out about it all. His involvement ups the ante on my entire career."

For Francke, it's not the first time he's worked with a rock 'n' roll superstar. In addition to releasing a number of solo albums, the Michigan-based musician has shared the stage with Bob Seger, Steve Winwood, Eddie Money and Chuck Berry, among others.

The 'Heartless World' album officially comes out May 31, but is currently available for streaming on Francke's official site. In addition, 'Summer Soldier (Holler If Ya Hear Me)' can be heard here.