Smooth jazz is a radio format that includes songs by artists such as George Benson, Pat Metheny, Kenny G, Luther Vandross, Sade, Robin Thicke, Anita Baker, Basia, Dave Koz and Chuck Mangione. It began in the 1980s as "adult alternative" or NAC, a well-defined radio format, with jazz, new-age music and adult contemporary music. In the 1990s, the format became much more jazz-oriented, with very little new-age, and emphasizing young artists.