Among last year’s more buzzworthy events in the contemporary-classical world was a performance by the JACK Quartet of the complete works for string quartet by Iannis Xenakis, at (Le) Poisson Rouge. Xenakis, a Greek composer, music theorist and architect who died in 2001, was known during his lifetime for using mathematical processes to fashion complex pieces with a rugged wildness mirroring the chaos and grandeur of nature. Lately, Xenakis’s works have begun to attract a following far beyond cloistered new-music circles, as indie-rock and noise fans have embraced their fierce power.

In its critically acclaimed concert, the JACK Quartet, a young ensemble whose members came together at the Eastman School of Music, demonstrated a real flair for making Xenakis’s craggy string-quartet works sing and dance. The group went on to record Xenakis’s four string-quartet works—Tetras, Tetora, ST-4/1,080262 and Ergma—for the Mode Records label, for which this unique composer’s works are a specialty.

Now, the JACK Quartet is celebrating its new CD with a record-release concert at Joe’s Pub on Sunday, July 5, at 7:30pm, and we’d like to send you to hear the group play live. The program will include some Xenakis, as well as newer pieces by Elliott Sharp, Jeff Myers and Kevin Keller. One lucky winner will receive a pair of tickets for the concert, as well as a complimentary copy of the JACK Quartet’s all-Xenakis CD. To enter, just go here, answer one not-especially tricky question and fill in your contact information. One winner with the correct answer will be randomly selected at noon on Friday, July 3.