Ai~n no Uta is very difficult but very fun, too. Second-best file in the bracket, IMO.
Domino is freaking hilarious. It was doing fine (intro goes on way too long) until... well... you'll see.
I can't wait until the Emoticons by Christine gets released. Hinoi Team is ridiculously bad. "LOL SONGS IN JAPANESE ^_^" This file is pretty good though, probably one of the better ones in OSC5.
Radio Star is freaking awesome. I don't know the guy who made it, but I'd be interested in talking with him a little bit. This is hands down the best file in Bracket 1.
Rock Steady is okay, but a little repetetive. What's with the challenge steps? You should have just made this file left-facing, added some random mines and submitted it to the ITG bracket. EDIT: Ohhh, it IS all left-facing.
Shake it Down is fun stuff! Also a great B1 file.
Under the Sea has some issues but it's good.
You raise me up is way too freezey, not that there's much else that could have been done.
As for Kagekiha... it's really double-steppy. I wrote this song, so I feel kind of weird commenting on it.