I was about to say "castle of glass", by linkin part but... thanks to mogsworth, now... it's... (almost)... no more this awesome song. Out of my head, alligator song ;p
" 'cause I'm oooonly a crack, ..." (keeps singing to avoid getting the alligator song in head instead)
(Castle of glass is replaced by knights of Sidonia (Angela *o*) on mornings, though. This song is so powerful on mornings ^^)