By Leon Ratz and Claire MurphyFrom the first drum solo to the last trombone slide, BC bOp!'s latest musical creation, FacebOp!, proved just as addictive as its namesake. The jazz ensemble's Saturday night, two-and-a half hour concert at Robsham Theater featured an eclectic mix of jazz, blues, swing, boogie woogie, and Latin pieces performed by 24 top-notch instrumentalists and vocalists.