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Arguably Perry's most unconventional official releases (and seemingly most experimental), "ET" was a no. 1 hit that somehow hasn't gotten as much respect or love as her other chart toppers. A combo of dub step, rave/techo and rock, "E.T's" beat is seemingly inspired by Queen's "We Will Rock You." Really though, it's a ballad with lyrics about strange bedfellows in darker musical wrappings that Perry has rarely ventured into during her career. A version of the track featured Kanye West (which what helped it become a smash), but it's the dance remixes by Dave Aude and Johnson Somerset & John Monkman which really took the song to different dimensions.