Hyde was the lead singer in L’arc en Ciel. I first learned of them from the many anime themes they have done. They did a couple of pieces for Rurouni Kenshin; they did a theme for Slam Dunk and for Great Teacher Onizuko. You may know them most recently as the group who performs the opening theme for Fullmetal Alchemist. An internet search for music will turn up quite a bit, but you can also find Hyde’s solo work which is often quite nice.
Some favorite Hyde (L’arc en Ciel) songs: Oasis, Secret Letters, Spirit Dreams Inside, White Song
Below are pics of Hyde and L’arc en Ciel. There is also one pic of Ken, also from L’arc en Ciel. He is the guitarist.