Sound Horizon (サウンドホライズン), abbreviated by fans as Sanhora (サンホラ), is a Japanese art rock/symphonic metal band comprised of the composer Revo as its leader. It was conceived in 2001 when the band released their 1st Story CD, Chronicle, at Comiket 61. Revo had previously recorded and released several demo songs via the internet in the late 90's. He is also the longest running and currently the only official member of Sound Horizon. As of the band's 5th Story concert, he is often referred to as '陛下' ('Heika' which means 'His Majesty') by fans and other members to signify his leadership position.