Coachella 2016: See Photos of Weekend One’s Biggest Guest Appearances
From Rihanna to Angus Young, here’s who crashed the stage

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The headliners may get top billing on the posters, but in the aftermath of Coachella 2016's first weekend, the buzz has been all about the guest stars. From Angus Young's rousing – and nicely synergistic – turn alongside Guns N' Roses, to Rihanna's cameo with Calvin Harris, the fest was jam-packed with surprise appearances. Here are some that have defined the fest so far.