The song of the summer is easy to spot. You hear it in the softer-louder-softer of passing cars, dripping out of clothes stores, wafting up from block parties. It's inescapable. Think of last year's Katy Perry ode to boobs and hatefully nonstandard spelling, "California Gurls." (The Far*East Movement's "Like a G6" would have been the song of last summer, as it was released last April, but the single push didn't happen until late August, and it rode the charts high all through October and November.) Remember Beyonce and Jay-Z's domination of 2004 with their declaration of car-exploding mutual adoration, "Crazy In Love"? And there's the recent mother of them [...]