At an Equinox on the Upper East Side, Derek Beres brings his own brand of music to class. A yogi, D.J. and music writer, he has teamed with the producer Dave Schommer, known as “Duke Mushroom,” to create EarthRise SoundSystem. (Their full-length album is titled “The Yoga Sessions.”) The idea was to reinvent yoga music, which they do by drawing overwhelmingly on global rhythms that are heavy on percussion.
