NOW 35While Now, Vol. 34 featured four songs that had reached the top of the Billboard Hot 100, the 35th volume contains one: Katy Perry's "California Gurls." The Now compilers can't be faulted for the shortage of number ones here, however, not when Ke$ha's "TiK ToK" (Now, Vol. 33), Rihanna's "Rude Boy" (Now, Vol. 34), and "California Gurls" hogged the spot for a combined 20 weeks. Regardless, this is one of the more "now" volumes of the series; when the