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Heavy Metal Day honors Ronnie James Dio on May 16

cultural-heritage · 2026-05-16

May 16 marks World Heavy Metal Day, initiated by fans to honor Ronnie James Dio, who died in 2010. Dio was a seminal figure in the genre, known for his work with Black Sabbath, Rainbow, and his solo project Dio. He popularized the "devil horns" hand gesture, now a universal metal symbol. The day has become a global celebration of metal culture, though it lacks official international recognition. The article also mentions Tom Morello's documentary on Judas Priest, linking the band to anti-fascist themes.

Key facts

  • World Heavy Metal Day is celebrated on May 16.
  • The date honors Ronnie James Dio, who died in 2010.
  • Dio was a member of Black Sabbath, Rainbow, and his solo band Dio.
  • Dio popularized the 'mano cornuta' (devil horns) hand gesture.
  • The day was started by fans and has no official international recognition.
  • Tom Morello released a documentary about Judas Priest.
  • Morello's documentary connects Judas Priest to fighting fascism.
  • The celebration spans generations and maintains a strong identity.

Entities

Artists

  • Ronnie James Dio
  • Tom Morello

Institutions

  • Black Sabbath
  • Rainbow
  • Dio
  • Judas Priest

Sources