The first song "Butterfly" has a jazzy feel to it with strong flowing bass, classical drumming and guitars with a blues sound to them. Not to mention Yasu's smooth memorizing voice. The instrumentals and Yasu's voice flow like a river. The extra song is a totally different song than the first one. It is a hard rock/metal song that has a pop feel to it. The guitars are very heavy and the drummer is pounding his drums. Yasu on the other hand sings in an upbeat way but doesn't scream or growl, which adds an extra layer to the song. *I really enjoyed this single and ABC get better and better with each single they release.