There are at least two artists by the name of Ruido. 1) Puebla-based beatmaker and producer Ruido associated with the Mexican PIR▲.MD record label.
2) Californian hardcore thrash with a touch of grind, with lyrics in both english & spanish.
They've shared 7"'s with bands like Fuck on the Beach, Te-Zacrifico & Insult. Check here for music!!!

http://www.knowrecords.com/ruido.html
http://www.power-it-up.de/ruido/s4100_aid21/index.htm

Read more about Ruido on Last.fm.