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PARIS – An unknown musician set up a piano and delivered a powerful take on John Lennon’s “Imagine” as mourners gathered outside Paris’ Bataclan venue.

Rolling Stone reported that the musician played at the site of the Eagles of Death Metal concert where a deadly terrorist attack took place.

ISIS has claimed responsibility for the worst violence witnessed in France since World War II, a volley of nearly simultaneous terror attacks that the French President called “an act of war.”

The assailants targeted six sites Friday night in Paris, the deadliest being a massacre at a concert hall where at least 80 people were killed.

French authorities put the number of dead at 128 as of Saturday morning (U.S. time), though the death toll is expected to fluctuate as the situation becomes clearer.