The Iraq War, terrorism, and Katrina have all inspired plenty of political music. But many protest songs are purposefully vague, avoiding preachy messages or obvious slogans. Today, we look at the new breed of protest songs with singer and activist Steve Earle and Pitchfork Media writer Chris Dahlen. Also: Bossa Nova has its roots in early 60's Brazil. On her new album, "The New Bossa Nova," Brazilian singer Luciana Souza gives the genre an update as she covers material by Joni Mitchell, Leonard Cohen, Sting, Elliott Smith, Steely Dan and others. This is a repeat edition of Soundcheck.