I'll start with L'Arc-en-Ciel.
L'Arc-en-Ciel is a rock band formed in Osaka in 1991. Their members are hyde (vocals), tetsuya (bass), ken (guitar), and yukihiro (drums). They also had an "alter-ego" called P'UNK-en-Ciel, which played heavier versions of some of their songs. Both the original and P'UNK versions of Kasou are great, and Route 666 is my favorite.
Here's what they look like live.