ROCO’s Unchambered series starts on October 19 with clarinetists Nathan Williams and Maiko Sasaki in a program ranging from Classical favorites to modern commissions. The concert, entitled “Mendelssohn to Maroney: ROCO Clarinetists Come of Age” features works by Stravinsky, Michael Tenzer, Gary Schocker, Marcus Maroney, Bela Kovacs, Felix Mendelssohn, Theresa Martin, and Amilcare Ponchielli.