Nonesuch Records marked Kronos Quartet's 40th anniversary year with two releases this month: the Kronos Explorer Series five-CD box set and a new album, A Thousand Thoughts. As a highlight of its anniversary season, Kronos was in New York City to perform at Carnegie Hall late last month and, in advance of the concert, was the subject of a marathon stream of music and audio tributes on New York's Q2 Music, the online new-music station from WQXR. The event, KRONOS AT 40, culminated in a live, video-streamed performance by Kronos Quartet from The Greene Space at WQXR. It has now been newly mixed and mastered; you can watch it below.

"On Monday, March 24 at 7:30 pm, Q2 Music presented a live concert and videocast from The Greene Space at WQXR featuring one of the most renowned and influential new-music groups of our time, the Kronos Quartet," says the station. "Celebrate the ensemble's 40th anniversary with an exclusive evening of music and conversation, hosted by Helga Davis."

The program opens with Kronos at 40, a film by Evan Neff, and includes performances of Nicole Lizée's Death to Kosmische, Jacob Garchik's arrangement of Geeshie Wiley's Last Kind Words, Osvaldo Golijov's arrangement of Margarita Lecuona's Tabú, and Mary Kouyoumdjian's Bombs of Beirut. The first and last pieces were written for Kronos; the other two were arranged for Kronos.

To pick up a copy of the Kronos Explorer Series box; A Thousand Thoughts; Clint Mansell's score to Darren Aronofsky's new film Noah, on which Kronos performs; or any of the albums in the group's extensive Nonesuch catalog, head to the Nonesuch Store, where CD orders include a download of the album at checkout.