Henri Antti Viljami "Trollhorn" Sorvali[1] (born 19 October 1978), is a Finnish musician, known as a keyboardist and guitarist of pagan metal band Moonsorrow, and keyboardist of black metal band Finntroll.
He has also played in bands called Thunderdogs and Lakupaavi (a side project done as a joke by members of Moonsorrow), and played as a session musician on Ensiferum's self-titled debut album and Glittertind's mini-album Til Dovre Faller.
He created the soundtrack for the 2009 Finnish horror film Black Blooded Brides of Satan.
Sorvali gets inspiration from bands like Anthrax, Bal-Sagoth, Bathory, Cannibal Corpse, Darkthrone, Helheim, Maze of Torment, Merciless and Thyrfing.
He no longer plays live with Moonsorrow though he remains active with the band through recording in the studio and composing most of their music.