Unknown pianist performs John Lennon's Imagine for Parisian mourners at site of massacre

A mystery musician set up a grand piano at the site of the Paris massacre to perform a poignant rendition of John Lennon's 1971 classic, Imagine.

The venue, Bataclan, was shrouded with hundreds of mourners who placed flowers and memorials at the site.

The terrorist attack at the Eagles of Death Metal concert resulted in 118 deaths. France has declared 3 days of national mourning following the tragedy.