The Pixies reunion has now yielded more than just sold-out concerts. The iconic rock act has penned its first new song in 13 years, "Bam Thwok," which will be available tomorrow (June 15) at midnight for digital download exclusively via Apple's iTunes Music Store. The cut features bassist Kim Deal on lead vocals plus a 15-second organ solo recorded years ago by guitarist Joey Santiago's father-in-law while he was doing missionary work in the Philippines.

Deal says her lyrics were inspired by an art book she found on the street. "This kid had written a short story, a paragraph really, about a party that took place in another universe, about people and monsters that were partying together," she says. "It's a song about loving everyone [about] showing good will to everyone."

Adds vocalist/guitarist Frank Black, "The recording process was very relaxed and it didn't feel like 12 years had passed." The cut is the first new Pixies original song to emerge since the Oct. 1991 release of the group's last studio album, "Trompe Le Monde."

The Pixies are in the midst of a European tour that hits Paris tonight (June 14) and wraps July 11 at the T in the Park Festival in Scotland. A U.S. tour, including a pair of Lollapalooza appearances, begins July 22 in Ventura, Calif.