There are multiple artists with this name: 1) Ceremony is a hardcore punk band from the San Francisco Bay Area that formed in 2005.
http://www.ceremonyhc.com 2) Ceremony is a post-punk/shoegaze band from Fredericksburg, Virginia, featuring two members of Skywave. Their next release is slated to be released in Mid April. 3) Ceremony is a rock band based in Australia with a worldwide release of their debut album available early 2008. 4) Ceremony was a short lived dutch death metal band that hybridized thunderous New York death metal with Scandinavian death metal.

Read more about Ceremony on Last.fm.