On Tuesday, May 30, Attila Csihar, frontman of Norwegian black metal pioneers MAYHEM, joined PANTERA on stage for a performance of the song “Walk” during the Philip Anselmo-fronted act’s sold-out show at Barba Negra in Budapest, Hungary. Fan-filmed video of Attila‘s appearance can be viewed below.

PANTERA‘s Budapest show marked the band’s third live concert in Europe in 23 years — since May 2000, when the band last toured the continent in support of what would be their final album, “Reinventing The Steel”.