Mucc is a Japanese visual kei rock band, formed in Ibaraki Prefecture in 1997. The classic line up of Tatsuro on vocals, Miya on guitar, Yukke on bass, and Satochi on drums was solidified in 1999 following the departure of original bassist Hiro. After 24 years, Satochi retired from the music industry in October 2021, leaving Mucc a trio. They have released 16 studio albums, with 2020's Aku being their highest-charting. Although predominately a heavy band both lyrically and musically, Mucc is known for switching between music genres and styles frequently. Kerrang! included their fourth studio album Kuchiki no Tō on a list of 13 essential Japanese rock and metal albums.