There are three bands with this name.

1. The Separation formed in 2004 and are based in Bromley, UK. They play a furious marriage of post-hardcore riffage to pop-laden hooks, and have been compared to Rise Against and Billy Talent by national magazine Rocksound. Check out the songs under 'Retire Your Engines' for this band's output.
http://www.theseparation.co.uk
http://www.myspace.com/the_separation

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2. The Separation are an indie-rock band from Norman, Oklahoma. They have been compared to Quasi, They Might Be Giants and The Decemberists.
http://www.myspace.com/theseparation
http://www.theseparation.net/

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3. The Separation was from Redding, CA with members of Set it Straight and Skeletons.
http://www.glorykid.com/gkr/?p=501
http://www.myspace.com/theseparationca
They were awesome. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.