Spotted on the Metal Hammer website:
Metallica played a track that will appear on ‘Death Magnetic’ at their Ozzfest debut on Saturday night in Dallas, Texas in its entirity, the first all-new material from the band in half a decade.
The track that Metallica have played is called ‘Cyanide’…
Sounds good — I’m looking forward to hearing the whole album when it’s released next month, on Friday 12 September.
There’s a better quality recording here (with no video), seemingly recorded from the sound-desk.