As with summer movies, the area's summer-theatre scene - featuring, at last count, a whopping 68 productions scheduled by 22 organizations - is jam-packed with escapist fare: musicals, comedies, mysteries, musical-comedy mysteries. But like the random art-house release that manages to sneak into Hollywood's blockbuster-centric season, this summer will also feature occasional dramas and classical works, plus no less than four Pulitzer Prize-winners - five, if you count one of them being produced at two separate venues.