Portland Chamber Orchestra begins its new season with an all strings concert featuring pianist Chad Heltzel and percussionist Brett Paschal. Program includes the Little Suite of Carl Nielsen, J.S. Bach’s Piano Concerto in D minor, Ernest Bloch’s Concerto Grosso No. 2, and the Concerto for Marimba and String Orchestra by Ney Rosauro. This concert also iintroduces an exciting collaboration between the musicians of PCO and the instrumental music students of the Evergreen School District in Camas, Washington. Two performances: September 13 at 7:30 p.m. at Union High School in Camas; and September 14 at 3 p.m. in the Agnes Flanagan Chapel on the campus of Lewis & Clark College.