Classy teardrop style, way up the neck backup! Watch out for the first measure, it's got an extra beat. Listen to the original recording a lot. It will help you internalize the sound of Sonny's playing. It really stands out, but doesn't stand on the vocal. Bobby sings high, but Sonny plays even higher. Playing in a different range than the vocalist is a great way to be heard without fighting over sonic real estate.