Sigh is a Japanese avant-garde metal band formed in 1990, known for their experimental approach to extreme music that blends black metal with orchestral arrangements, jazz influences, and surreal soundscapes. Led by mastermind Mirai Kawamura, the band has consistently pushed the boundaries of metal through their intricate compositions and theatrical performances across numerous critically acclaimed albums. Their unique fusion of aggressive instrumentation with classical and unconventional elements has established them as pioneers in the avant-garde metal genre.