Vocal surf can be interpreted as a regional variant of doo wop music, with tight harmonies on a song's chorus contrasted with scat singing. According to musicologist Timothy Cooley, "Like instrumental surf rock with its fondness for the twelve-bar blues form, the vocal version of Surf Music drew many key elements from African-American genres ... what made the Beach Boys unique was its ability to capture the nation's and indeed the world's imagination about the emerging New Surfing lifestyle now centered in Southern California, as well as the subtle songwriting style and production techniques that identify the Beach Boys' sound." In 1963, Murry Wilson, Brian's father, who also acted as the Beach Boys' manager, offered his definition of surf music: "The basis of surfing music is a rock and roll bass beat figuration, coupled with raunch-type weird-sounding lead guitar, an electric guitar, plus wailing saxes. Surfing music has to sound untrained with a certain rough flavor in order to appeal to teenagers. ... when the music gets too good, and too polished, it isn't considered the real thing."