I remember "I Kissed A Girl" was one of the two songs back then that was able to cross over between pop, rhythmic, hot AC, and alternative formats. The only other song being Gnarls Barkley's "Crazy." Now we've had so many songs doing the same. "Rolling In The Deep", "Forget You", "Pumped Up Kicks", "Someone Like You", "We Are Young", "Somebody That I Used To Know", etc.