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Illness is threatening Muse's weekend plans. 

The British rockers were forced to cancel Thursday night's concert in Sao Paulo, Brazil due to an unspecified illness affecting an unspecified member or members of the band.  But with the additional rest, they say they hope to be performance ready for their headlining slot at Lollapalooza Brazil on Saturday. 

Muse is also scheduled to play both weekends of California's Coachella Festival later this month. 

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