Henri "Trollhorn" Sorvali, born October 19, 1978, in Finland, is the guitarist and keyboard player of the folk metal band Moonsorrow, and keyboard player for Finntroll. He also played keyboards on a few occasional gigs with The Rasmus in the late 90's. 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.

Sorvali gets inspiration from bands like Anthrax, Bal-Sagoth, Bathory, Cannibal Corpse, Darkthrone, Helheim, Maze of Torment, Merciless and Thyrfing. His idols are Frank Zappa, Danny Elfman, and Jeremy Soule.

He is the cousin of Ville Sorvali, frontman of Moonsorrow. He has also worked as a music teacher in the Sibelius-lukio (Sibelius high school) in Helsinki.