Since the 2004 death of lyricist Fred Ebb, composer John Kander has kept working on a musical the duo had been writing. It’s due to open Aug. 9 in Los Angeles. “A backstage musical and murder mystery combined, ‘Curtains’ is a whodunit in more than one sense of the word. It may also be the last new work to be produced on this scale from Kander and Ebb, one of Broadway’s best composer-lyricist teams. And while that fact alone won’t likely spell curtains for the American musical, it’s certainly a sign that generational change is waiting in the wings.”