5. U2
This is a long shot prediction but if U2 and Coldplay came together on stage ... the result would be a show stopping performances. U2 is one of the biggest bands in the world, without a doubt. They also took the stage following the events of Sept 11, 2011.
During this time of unrest and violence in the world, these two acts could unite and bring a brief moment of peace and clarity. Seeing these two bands come together would be incrediable.
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