Darius Rucker will mentor the winner of a songwriting contest presented by the Nashville Songwriters Association International (NSAI) and CMT. The contest begins Sunday (Aug. 1) and runs through Oct. 31. After the grand prize winner has been announced, fans can vote on the remaining finalists for the CMT Listeners’ Choice Award, which will be presented in early 2011. All genres of music are encouraged. The entry fees are $35 (for current NSAI members) and $45 (non-members) per song submitted.