Kronos Quartet—whose 50th anniversary concert season culminates with the group's ninth annual hometown Kronos Festival at SFJAZZ in San Francisco through Sunday—has released several of its classic Nonesuch Records titles remastered in Spatial Audio on Apple Music Classical. You can hear Black Angels (1990); Pieces of Africa (1992); Howl, U.S.A. (1996); Kronos Caravan (2000); Nuevo (2002); Terry Riley's Sun Rings (2019); and the three string quartet's Steve Reich wrote for Kronos—Different Trains (1989), Triple Quartet (2001), and WTC 9/11 (2011)—in Spatial Audio on Apple Music Classical now here. And check out Kronos founder and violinist David Harrington's interview with Apple Music Classical, about the quartet and its legacy, in the Kronos Quartet Essentials playlist here.

The Kronos Festival, which began at SFJAZZ Center in San Francisco last night, continues through Sunday, featuring the farewell performances of violinist John Sherba and violist Hank Dutt, members of Kronos for more than 45 years, as well as their longtime manager, Janet Cowperthwaite. For details, visit kronosquartet.org.

As part of the Kronos: Five Decades celebrations, Nonesuch released the group’s award-winning 1990 album Black Angels on vinyl earlier this year; the Evening Standard included it among the “100 Definitive Classical Albums of the 20th Century.” Late last year, Nonesuch released the first-ever vinyl edition of the acclaimed 1995 album Kronos Quartet Performs Philip Glass, which the Washington Post called “an ideal combination of composer and performers.”