Pata again(Ra:IN, Ex-X Japan), Yoshiki (Violet UK, Ex-X Japan), Taiji (Otokaze, DTR, Ex-X Japan), Toshi (Ex-X Japan), Maakii (High and Mighty Color), Gotoh (Asian Kung Fu Generation), Syu (Galneryus, Animetal), Daita, Kazuma and Hideki (Ex-Siam Shade), Inoran (Ex-Luna Sea), Bou (An Cafe), Mika Nakashima, Circuit V Panther (Ex-Sex Machineguns), Tetsu and Hyde (L'arc~En~Ciel), Daisuke Ishiwatari (Guilty Gear X Compositor), Tatsurou (Mucc), Ishida, Seaki and Isamu (SunSet Swish), Kyo, Die and Kaoru (Dir En Grey), Alexis Lahio (Children Of Bodom), Matt Heafy (Trivium), James Hetfield and Kirk Hammet (Metallica), Jonathan Davis and Munky (KoRn), Herman and Sam (Dragonforce), Joey Jordison (Slipknot), Justin and Dan Hawkins (The Darkness), Daron and Serj (System Of A Down) and so many others...:p