Kaliea Miller, 10, gets impromptu French horn lessons from Charles Crabtree, 16, on Aug. 18 at a community festival in Arbor Lodge Park. Crabtree, principal horn player in the Portland Youth Philharmonic, and others were teaching children the basics of several instruments, including vibes and violin. Many bands performed during the afternoon, including the headlining Oregon Symphony. The symphony will play another free outdoor concert at 7 p.m. on Thursday, Aug. 30 in Tom McCall Waterfront Park.