Studio-cooked pop hooks, kitschy-cute outfits and carnival-esque live performances: These are the ingredients in Katy Perry's Top 40 success. Diva-esque vocals? Not so much. But the singer-songwriter looks keen to prove her pipes with rock power ballad "Unconditionally," the second single from her uber-anticipated Prism album. Listen above.

After a hushed opening with minimal electronic production, "Unconditionally" explodes into a vocal showcase as Perry belts the simple yet strong lyrics over booming percussion: "Unconditionally, unconditionally / I will love you unconditionally / There is no fear now / Let go and just be free." 

To promote Prism, Perry unleashed earworm "Roar," and experimented with trap ("Dark Horse") and '90s dance music ("Walking on Air"). But none flaunt the vocal prowess like "Unconditionally" does. Want more on Prism? Get everything you need to know about Prism right here before the LP drops on Tuesday (October 22).