question_text: Rowland Salley's best-known tune is "Killing the Blues", which has been most recently covered by which American singer-songwriter active mainly in the outlaw country music and Southern rock genres?
decomposition: return the  American singer-songwriter active mainly in  the outlaw country music and  Southern rock genres ;return #1 that Rowland Salley 's best-known tune Killing the  Blues has been most recently covered by