Nah: Katy Perry, “Harleys in Hawaii” – Many aging rockers would like a word with Katy Perry, who is not-so-ambitiously trying to steal their retired-American-motorcycle-Hawaiian-vacation vibe. This track is a bit more apathetic than I’m used to Perry sounding, and the result is an unmemorable tune about nothing. Take that Harley, and ride it straight to hell. At least then there would be some fire. —Maria Sherman