Never mind the cappuccino -- how about a cup of Puccini for a nightcap? Romanian folk dances at three in the morning? Seven nights a week, from midnight until 7 a.m., insomniacs and culture-lovers can binge on Classic Arts Showcase, an unpredictable lineup of arias, dance numbers and concert performances, including classic clips from the likes of Maria Callas or Nelson Eddy -- all courtesy of Denver's municipal-access cable channel. The syndicated program is commercial-free and, like the wee hours, goes on and on.