The Festival’s focus on today’s music continues as world-renowned conductor and Festival composer-in-residence/co-curator John Adams takes the podium to lead his off-beat and grooving Must the Devil Have All the Good Tunes? with the extraordinary Jeremy Denk at the piano — listen for a second “detuned honky-tonk piano” to add its voice. Music Director Peter Oundjian conducts the final symphony by Christopher Rouse, which The New York Times called Rouse’s Sixth “a haunting and profound farewell” true to the composer’s character: “all of Mr. Rouse — contemplative elegy, rowdy playfulness, eclectic homage — is in this score.” In her Tumblebird Contrails, composer Gabriella Smith calls to mind the Pacific Ocean and “keening gulls, pounding surf, rush of approaching waves, sizzle of sand, and sea foam in receding tide.”