Stay By My Side - Megurine Ruka (by ROY).

It's only been a few days since the release of the third addition to the Vocaloid family (crypton wise anyways). It's a rock song, yes, and I am very fond of rock. I personally think that Ruka's voice fits rock more than Miku's. xD Just my opinion. Her lower voice just makes it sound more epic. The song sounds like something Versailles might do.