X Japan is a Japanese rock band from Chiba, formed in 1982 by drummer and pianist Yoshiki and lead vocalist Toshi. Starting as a predominantly power/speed metal band with heavy symphonic elements, they later gravitated towards a progressive sound with an emphasis on ballads. Besides being one of the first Japanese acts to achieve mainstream success while on an independent label, the group is widely credited as one of the pioneers of visual kei, a movement among Japanese musicians comparable to Western glam.

Tomoaki Ishizuka , known exclusively by his stage name Pata, is a Japanese musician. He is best known as rhythm guitarist of the visual kei rock band X Japan. He joined the band in 1987, stayed with them until their dissolution in 1997, and rejoined when the band reunited in 2007.