L to R: Chris Martin, Bono, and Brandon Flowers

Coldplay's Chris Martin, U2's Bono, and the Killers' Brandon Flowers sharing one stage -- talk about a dream collaboration!

At a London benefit concert for the War Child charity last Wednesday, that dream became reality as Martin and Bono joined the Killers onstage for a rendition "All These Things I've Done," a tune off the Las Vegas quartet's 2002 debut Hot Fuss.

Below, watch video of the famous frontmen performing onstage together. The quality isn't perfect, but the performance is stellar -- and check out Flowers' crack at Coldplay's recent copyright woes in the beginning of the video.

Heroes, Vol. 1 -- a compilation album benefiting War Child that features acts like Beck, TV on the Radio, and Lily Allen covering classics from artists like Bob Dylan, David Bowie, and the Clash -- drops in U.S. retail outlets tomorrow. Hear the Hold Steady's cover of Bruce Springsteen's "Atlantic City" here, and stream the whole album here.

Watch: The Killers, Coldplay and Bono, "All These Things That I've Done"