NEW YORK (Reuters) - Country singer Brad Paisley on Tuesday defended his new duet with rapper LL Cool J, which has been criticized for its commentary on U.S. race relations. "Accidental Racist" is a track from Paisley's ninth album, "Wheelhouse," which was released on Tuesday. The song describes a hypothetical encounter between a Confederate flag-wearing white Southern man and an urban African-American man in a coffee shop. Some critics have disparaged the song's content and artistry. "I wouldn't change a thing," Paisley, one of country music's most popular artists, wrote on Twitter. ...