It was hit the road, Jack, for oldies fans who listen to WCBS-FM radio after the station yesterday ended 33 years of playing rock classics and abruptly axed legendary DJs Cousin Brucie, Harry Harrison and Bill Brown. WCBS, 101.1-FM on the dial, changed its name to "Jack" and stunned listeners by ditching its tried and true playlist to embrace a new format that features random songs of various styles. "We're going from 400 to 500 songs to well over 1,200 songs, with less repetition," said CBS-FM vice president Chad Brown, who flipped the switch to the new format at 5...