While Coachella's first weekend was winding down, other music events continued to happen elsewhere in the world, some of which also featured surprise guest appearances. Up in Seattle, for instance, Sir Paul McCartney brought his One On One tour to Key Arena, where he welcomed Nirvana's Krist Novoselic on stage to play bass on "Helter Skelter." It's not the first time these two have rocked together. Watch footage below via Spin.
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