Unknown Caller is a song that insists you join in... now you can. The band's production team are aiming to create a 'global chorus' of people singing the track. Sing up - and send us your video clip.

Here's how it works. Choose a section of the song (see below) - or choose them all - set up your camera and start singing. Might be solo. Might be with your friends. Might be an entire choir. Shoot the clip and then email it to us at unknowncallervideo@u2.com NOTE: (If the file is over 10megs, post it in Zootopia instead.)

Here's what to do.

EMAIL
Email your video as either a .mov or an .avi file to unknowncallervideo@u2.com and make sure it is no larger than 10 megs. If it is larger than this then follow the directions below.

POST
To post your clip in Zootopia -our own U2.com community-make sure you add a tag when you post it, starting with the word 'chorus' - for example, 'Chorus Delhi' or 'Chorus Cardiff'.

Choose one of these sections to sing ... or all of them :

Go, shout it out, rise up
Oh, oh
Escape yourself, and gravity
Hear me, cease to speak that I may speak
Shush now
Oh, oh
Force quit and move to trash

Restart and re-boot yourself
You're free to go
Oh, oh
Shout for joy if you get the chance
Password, you, enter here, right now

Oh, oh
You know your name so punch it in
Hear me, cease to speak that I may speak
Shush now
Oh, oh
Then don't move or say a thing


DISCLAIMER: When you submit your 'Chorus' clip to us, you're giving the team permission to use it in the way their artistic muse dictates - free and gratis - wherever! Who knows where it could end up... )

To help get you in the mood, - watch this clip - of the audience singing along in London.