Info: In X Japan, hide is the second most credited songwriter and the only member other than Yoshiki to pen one of their singles.
He appears to have been the most experimental as well, with the song "Xclamation" from 1989's Blue Blood, co-composed with Taiji, including traditional Indian percussion, and the aforementioned single, "Scars", being progressive metal.
According to Alexey Eremenko of Allmusic, "Scars" and "Drain" from 1996's Dahlia were a glimpse into hide's future experiments in industrial rock.
The Japan Times's Philip Brasor commented that when hide died, "Japanese metal lost its greatest practicing innovator."
-Taken from hide's Wikipedia page: