This is the song "Wake" from Linkin Park without the lyrics... :O.
Linkin Park Live In Clarkston Projekt Revolution 2007.
EDIT: The real title of this song is "Announcement Service Public" by Linkin Park. This was from LPU. www.lpunderground.com.
Wake up.
Wake from the album Minutes to Midnight - the third studio album by American band Linkin Park, released on May 14, 2007, through Warner Bros. Records.