“Miley's "Party in the U.S.A.". Ke$ha's "Tik Tok". Katy's "Last Friday Night (T.G.I.F.)". This is the chart-clobbering, brain-zapping, awe-inducing 21st century lineage to which "Doing It" clearly aspires—and just-as-clearly nails. You know it from that opening giggle, the kind of "what me worry?" laugh someone might let slip after splashing a creepy barfly with water, stealing a six pack, or drain”