Dropkick Murphy's released a charity EP to benefit Boston bombing victims

Boston's Dropkick Murphys have released a charity EP to benefit victims of the Boston Marathon bombing. The single includes an updated version of their song "Rose Tattoo" with contributions from Bruce Springsteen, along with live, acoustic recordings of "Don't Tear Us Apart" and "Jimmy Collins's Wake."

It's available exclusively through iTunes for the special price of $1.29. Everyone involved has agreed to donate 100% of the money raised through this release.

The band's most recent record, Signed and Sealed in Blood, was released earlier this year.

For founder, bassist and singer Ken Casey, these songs aim "to tell you a life story in four minutes." The Dropkick Murphys will release a new album, Signed and Sealed in Blood, next week, and its single "Rose Tattoo" was inspired by Casey's own tattoos.

"Throughout life — trials, tribulations, dates, times, places, things that are important to you, family, people who have passed away — tattoos on my body document my life and what I've been through, things that have been important to me," Casey tells NPR's Audie Cornish. "You know, they're all a part of the story."