LOL, the cover's typically Shiina Ringo and Tokyo Jihen! It's weird!
Ok, I'm a new fan of Shiina Ringo (thanks to interest sparked off by chriskay's signature and avatar) and I'm currently loving Ringo no Uta and Meisai. They're really good!
I wonder if anyone here can introduce me to more of Tokyo Jihen and Shiina Ringo songs, especially their instrumentals!

Sorry, I'm more obssessed over their instrumentation as of the moment, though I have to agree Shiina Ringo packs a punch in her singing.