Bonnaroo crowds endure heat for Jay-Z, Conan

The festival experience _ for all its glory and its port-a-johns _ was on full display at this year's Bonnaroo.

More than 75,000 endured days that frequently topped 100 on the heat index. Heavy rain fell when the festival gates opened on Wednesday night, muddying the grounds. Bodies splayed out in exhaustion across the grass were common, as were umbrellas to shield the sun.

"How do you do it?" marveled singer-songwriter Regina Spektor just one number into her Sunday afternoon set. "You guys are like heat superheroes."

And yet, with few exceptions, the crowd remained enthused, eagerly soaking up some 100 acts, traipsing from stage …