The Young People's Symphony Orchestra concludes their season with the always-surprising concerto competition winners. If you want a look at the new kids on the block (pianist Joshua Herman, 15, a freshman at Monte Vista High School in Danville; flutist Alexandra Bailey, 19, a freshman at California State University East Bay; oboist Sofia Dunderdale,17, a senior at San Francisco School of the Arts) this is your chance. Sofia plays Vaughan Williams' Oboe Concerto, Alexandra plays Charles Tomlinson Griffes' Poem for Flute and Orchestra and Joshua takes the keyboard for Grieg's Piano Concerto.