BY ANNIE ZALESKIPop music often gets a bad rap for being disposable or vapid, and in many cases that's true. (Katy Perry, Danity Kane and the Pussycat Dolls, step right up!) But every year, a few irresistible bits of innovative ear candy rocket up the charts and seep into our subconscious. The following ten singles saturated the Top 40 -- or what passes for hit-oriented radio in this topsy-turvy musical climate -- while proving that accessibility doesn't necessarily preclude creativity.
