The 77-year-old "free jazz" pioneer and 2007 Pulitzer Prize in Music winner was taken to the Coffer County Hospital after suffering heat stroke during a performance on Sunday, Billboard.com reported.
He was first treated at a nearby medical tent, where he was given intravenous fluids, said a spokesperson for Bonnaroo.
Coleman is next supposed to travel to Kongsberg, Norway, for a July 6 concert.
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