i love their style of jpop/jrock.
My favorite songs of theirs are colors of the heart, Chance!, Zero no Kotae , Kimi no Suki na Uta, and d-technolife from Bleach, which was the first time i heard of them. but then again, it is their first single....
I especially love their Shamrock single, everytime i hear it, i would sing along, trying to imagine myself singing it live...hehe. even though i know no japanese nor do i understand the lyrics, never knew if there were translations...