In 2015, no jazz musician broke through to a wider audience as triumphantly as saxophonist Kamasi Washington. First came his brilliant work on Kendrick Lamar's To Pimp a Butterfly, then his own release, The Epic, a sprawling display of vintage jazz, gospel choirs and pop songcraft. Coachella audiences may get a chance to see how Washington's music has been evolving since then. "I definitely opened myself up," he told Rolling Stone last month. "I've changed up in the way that I approach, on a technical level, certain things. On the newer songs I'm writing right now … they're not in any particular kind of key. It opens up a different approach."