Evil violinist from the "Destructive Death" short story in comic book Strange Suspense Stories #19 (July 1954).
He threatens impresario William Mellinger and Max Katz of M.K. Recordings to let him perform and record for them, or else. They refuse, and Sagoro somehow uses sympathetic vibration to collapse their buildings, killing hundreds. Fortunately, the U.S. Army sends in its new experimental radar deflector-rejector unit which causes Sagoro himself to fall to pieces when he plays.