Tak Matsumoto is the guitarist, composer, and producer for B'z.
I am not qualified to make any judgement of Tak's guitar playing on a music level. I can't say if his technique is good or not. But I can say that I find his guitar playing is a joy to listen to, a perfect match for Koshi's emotion-filled singing. His fast solos are unbelieveable (how does he move his fingers so fast?) and his slow solos are sometimes heartbreaking. His composing skills are impressive; I can't believe how many wonderful melodies he's created and continues to create. With all of his success, he still comes across as very down-to-earth and friendly. He has a very cute and appealing personality. Tak, I admire you so much!
(Sorry it took so long to put up a picture of Tak. I was trying to find one without sunglasses, but he seems to only take pictures with them on recently.)