Watch Traveling Piano Man Perform 'Imagine' at Police Headquarters In Dallas

The globetrotting pianist, who has gained worldwide recognition playing John Lennon's "Imagine" after horrific tragedies, performed Sunday evening at Dallas Police headquarters. Davide Martello, also known as Kavierkunst, mysteriously showed up to the headquarters on Sunday and performed the hit song from the late Beatle. Martello, who has performed the song in Paris following the November attacks on the city, tweeted he was going to Dallas to help "promote peace."