Watch Metallica Rock in Rio
The metal icons headlined the opening night of this year's festival, with 250,000 people expected during the five-day event.
Other headliners include Smashing Pumpkins (May 26), Lenny Kravitz (Jun 1), Stevie Wonder (Jun 2) and Bruce Springsteen (Jun 3).
Video of much of Metallica's set has surfaced for fans to check it out.
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