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. -snip- Jack — known also as "Bob," "Ben" and "Dave" in other cities — is frequently described as "an iPod on 'Shuffle,' " — meaning you never know which kind of...