Here we have "I Belong To You", from 2009's Resistance (their fifth studio album). If you hear this song, you'll catch two in one. The English lyrics are of course "I belong to you" but there is also a French melody known as Mon Cœur S'ouvre à Ta Voix. This literally translates to my heart opens to your voice. It's kind of odd hearing Matt Belamy all of the sudden switch into singing French but he does it well.
How much pain has cracked your soul?
How much love would make you whole?
You're my guiding lightning strike
I can't find the words to say
They're overdue
I've traveled half the world to say
I belong to you
For the cache... it glows in the dark, literally and figuratively. You've seen this before haven't you 
. Replace as found, as it should stay put in its hide. Heading south? Your next target is Hysteria. Heading north? Find Knights of Cydonia.
FTF=Ronbonz