José Galván's amazing footwork is only one of the reasons why aficionados around the world call him the "King of Bulerías". It's a unique example of traditional flamenco as it is seldom performed today.

When my editor and I worked on José's footage – who we lovingly called "Raging Bull" behind the closed doors of the editing suite – I didn't want to believe it was in sync and he argued it was. Some footage was in Pal (@ 25 fps) and this was in NTSC (@ 30 fps). We had quite a row about this until we ended up comparing the two and jokingly agreeing that it was indeed in sync, but that 'Raging Bull's' footwork was just too fast for the Pal standard's 25 frames per second.

You can see more of this collector's item concert recording in our indie production Petenera – a Flamenco Drama in Music and Dance at musicfilmfactor.com.