“My World 2.0 begins with 16-year-old Justin Bieber raising his pipsqueak voice in a wordless croon: "Oh- oh, whoa, ah-ah-ah." If it sounds faintly like an old fashioned doo-wop vocal, that’s no accident: The song, Bieber’s fast-rising single "Baby, consciously crafted throwback. Listen to the chord progression, tapped out on a perky gynth: it’s lifted […]”