This is what the internet is all about, at least in the context of the music world. Someone was hanging out near U2's studio in Dublin, and recorded 53 seconds of a track they were performing as it could be heard through the open windows of the studio. A link to the mp3 was then posted to a popular U2 fan forum, and now I'm sharing the link with you (now hosted on my server):

"All Because of You"

The sound quality is not very good -- obviously, given the recording conditions -- but you can hear some classic Edge guitar work and a great vocal by Bono. There's a directness about it that reminds me of early U2, and something about it brings Achtung Baby to mind as well. It seems to have that elusive "it" Bono likes to talk about, especially as the chorus comes in. The average U2 fan might not be all that excited about this clip, but for a fanatic like me, it's Christmas in July!

UPDATE: Several fans have attempted to transcribe the lyrics on the clip. This interpretation is courtesy of Interference.com:

VERSE

'I was born, a child of grace
Built this town in my own space
Everything was lovely such a beautiful place
You left me no illusion
Stole your hand across the world
Shadow cast across my room
You ailing is my cue
The light in the confusion

CHORUS

All because of you
ALLLLL because of you
All because of you
I am, ALIVE, mmm I know you care'