Under the direction of Rob Duisberg, that’s the West Seattle Community Orchestras‘ Symphony Orchestra, rehearsing Bartok’s “Rumanian Folk Dances” last night in the auditorium at Chief Sealth International High School. Tonight, that’s where you will find them and the WSCO’s Flute Ensemble in concert, 7 pm. The program also includes works by Dukas, Grieg, Elgar, Tchaikovsky, Saint-Saens, Liszt, and “A Christmas Festival” by Leroy Anderson. The concert is free; a $5 donation is suggested (WSCO is a nonprofit all-volunteer community organization).