More than 20,000 Dixie Chicks fans in Houston bought the band's latest album, the 1.5 million-selling Taking the Long Way. That much is clear, along with the fact that the Dixie Chicks' Houston concert date was canceled. The promoter blames the radio stations. Initial reports cited slow ticket sales. But tickets for the Toyota Center show never went on sale. The country radio stations credit their listeners with the cancellation and blame the Chicks for a bad attitude. The fans will have to book trips to Dallas or Austin. Louis Messina, president of the Messina Group, the Houston-based concert promoter...