What makes a song "country" (or any other particular genre)? Here we have the case of Islands in the Stream, a duet sung by country singers Kenny Rogers and Dolly Parton; their rendition of the song ultimately ranked #1 on Billboard's Hot 100 chart for two weeks. But the song was originally written by the Bee Gees, apparently for Diana Ross, neither of whom are country singers. And yet Islands is ranked the best country duet of all time by Country Music Television (CMT). So is it the song, the singer(s), or the style in which the song is sung?