This is my second post with a music recommendation (scroll down for the first one).
The Back Horn is a rock/indie band from Tokyo. They've been around since 1998, but their major stuff has only been from 2001 onwards. There's not much else I can say about this band, other than the fact that I think they're under-rated.
A few of their songs that I like are:
Namida Ga Koboretara - One of their "heavier", more energetic sounds.
Mafuyu no Hikari - Youtube doesn't have the official music video for this song, but anyway...
Yaiba - Another one of their more energetic songs, albeit with less screaming then the 1st one :)
Cobalt Blue - yes, this is the actual music video for the song.