This is another band that I'm interested in right now. Here's a biography at Nippop.com because I'm too lazy to write an introduction myself.
I think I first came across them when I heard a song of theirs in a CM (commercial) for some cell-phone service. (In case you didn't know, most commercials in Japan are often accompanied by snippets of pop-music as opposed to original "jingles".) The song was Ishin Denshin, and that 30-second or so piece really got me interested. Before long I had their musiQ album ordered from YesAsia...
They mix pop, rap and catchy melodies in quite an interesting way. Though their songs are often a hit-or-miss deal for me, I feel that the hits far outweigh the misses. (Especially in the case of Hana, a wonderful song that I have hopes of learning to play on the piano some day.)
They've sometimes been accused of copying too much from other artists/songs (probably rightfully so in the case of Locolotion). But I'm more interested in the music than discussing the morals of re-using melodies and chord progression that have been around forever anyway.
You can hear some samples on the Sony Music Orange Range sound & video page.
Here are also direct links to the samples of the songs I've talked about: