John Wilkes Booth play by ‘Mad Men’ creator keeps eye on present in Baltimore debut

John Wilkes Booth play by ‘Mad Men’ creator keeps eye on present in Baltimore debut

When the curtain rises on the world premiere at Baltimore Center Stage, an actor portraying the Harford County native and presidential assassin John Wilkes Booth spreads his coattails, sits down on a fringed stool, hunches over a baby grand piano and begins plinking out a tune. Then the man who fatally shot President Abraham Lincoln steps away from the keyboard — and the piano continues playing by itself. Perhaps not coincidentally, the melody i…