Erno Matti Juhani "Emppu" Vuorinen (born 24 June 1978) is a Finnish guitarist, most famous for being a founding member and occasional songwriter[1] of the symphonic metal band Nightwish.

Vuorinen knew Jukka Nevalainen from elementary school and met Tuomas Holopainen at a gig by Nattvindens Gråt.

[2] The new band, called Nightwish, started as an acoustic music project and they asked Tarja Turunen to join initially for three songs.

[13] Vuorinen recorded guitar parts for Almah, a Brazilian metal band, order to help his friend and vocalist Edu Falaschi (former singer of Angra).

He was also involved with Brother Firetribe, an AOR band, and played on four albums released worldwide: False Metal (re-released as Break Out), Heart Full of Fire, Diamond in the Firepit and Sunbound.