A memorial service was held over the weekend for heavy metal heavyweight Ronnie James Dio.

Dio was the vocalist for the bands Elf, Rainbows, Heaven & Hell, and Dio. He was also the lead singer of Black Sabbath when Ozzy Osbourne was asked to leave the band in 1979. Dio popularized the “devil horns” hand gesture; a symbol which is famously applied to all genres of heavy metal music.

Dio announced he was battling cancer in the summer of 2009. He was 67-years-old when he passed away on May 16, 2010.

On Sunday, over 1,200 fans gathered at Forest Lawn Memorial Park’s Hall of Liberty in Los Angeles, to say goodbye to one of the greatest rock vocalists of all time. As the crowd chanted Dio’s name, they headbanged along to performances by Glenn Hughes of Deep Purple, Geoff Tate of Queensryche, and Paul Shortino of Quiet Riot. Meanwhile, growing numbers of fans gathered outside to watch the event on monitors.

To read more about the service click here.

\m/. RIP Dio .\m/