Portland Youth Philharmonic

The nation’s oldest youth orchestra revives a work it commissioned more than half a century ago: American composer William Bergsma’s brassy, exuberant Chameleon Variations. There also will be two other classics, Mendelssohn’s ever popular second Violin Concerto—with soloist PYP Concerto Competition winner Rachel Graves—and Tchaikovsky’s sixth and final symphony, the one that ends on a surprising note of bummer-dom rather than triumph.