[youtube]http://www.youtube.com/watch?v=aoM27ufMxjs&feature=player_embedded[/youtube]

This past weekend, the remaining members of Heaven & Hell performed a tribute set to late singer Ronnie James Dio at London’s High Voltage Festival. While Glenn Hughes (ex Black Sabbath/Deep Purple) and Jorn Lande took duties swapping vocals throughout the show, Down/Pantera frontman Phil Anselmo joined the group onstage during “Neon Knights.” Supposedly even Hughes was surprised by the Superjoint Ritual mastermind’s unscheduled appearance. You can check out fan-filmed footage of the performance above.