New Rock and Roll Hall of Fame member Cat Stevens is taking the "Peace Train" back on the road. He announced yesterday that he'll do a six-city concert tour in North America this December, his first series of shows in the US since 1976. His conversion to Islam followed, putting his music career on hold for a quarter-century. Stevens, who also is releasing a blues album on Oct. 27 produced by Rick Rubin and titled Tell 'Em I'm Gone, is using that stage name along with Yusuf, the name he took when he converted. The performer of 1970s-era hits "Wild...