When I reviewed Katy Perry’s PRISM, one of my very favorite songs (besides “Roar”) was current number one single, “Dark Horse”, featuring Juicy J. Definitely laden with swag, Katy Perry’s current single has hip-hop, crossover appeal. As much as I love the original, there is one cool cover via YouTube by vocalist Peter Hollens, who has delivered a number of worthwhile covers (“Shenandoah” is one of my favorite performances). On the incredibly clever cover of the Perry single, Hollens enlists the help of Sam Tsui, another incredibly talented vocalist. Adding to the excellence of the vocal performance itself is a cool video using strobe lights and other cool production effects. I won’t ruin the audio/visual experience – I’ll let you check out the cool video yourself.