Náttúra is a free outdoor event to raise awareness of aluminium smelting plants ruining the landscape.

The musical event attracted 30,000 people, about 10% of Iceland\'s total population.

The audience witnessed what can only be described as \"Björk whacking some congas\" during the Sigur Rós song Gobbledigook. Watch Bjork paying percussion with Sigur Rós:

Festivla organiser Einar Örn, Björk\'s former bandmate from Sugarcubes who joined her on stage for one song, simply said after the event: \"This was a truly momentous evening.\"