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By Randee Dawn

True fans never had to wonder what hole Fall Out Boy fell into in 2009 — they've been eagerly awaiting the band's reunion over the past four years, and turned up in sweaty force on the TODAY plaza Friday for a very hot performance.

Literally: It was already so hot on the plaza when the band — Pete Wentz, Patrick Stump, Joe Trohman and Andy Hurley — began playing that guitars were going out of tune, as TODAY's Matt Lauer observed.

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"They go from cold to hot really quick, the wood expands — a lot of science involved!" said Trohman.

Still, the band sounded terrific, blasting through three tunes amid ever-climbing New York City temperatures: "My Songs Know What You Did in the Dark (Light 'Em Up)," "Alone Together" and "Sugar, We're Goin' Down."

They're glad to be back, with their first album since 2008, "Save Rock and Roll," and as Wentz told Lauer and Savannah Guthrie, the extended absence was something they really needed to do.

"I think we knew we needed a break," he said. "Doing something (touring, recording) that long, straight, you need a break of some kind to, I don't know, like re-set yourself in life — start doing your own laundry at your own house."

At least they've got plenty of clean clothes for when they hit the road in September. Check out all the great videos for more as well as our favorite tweets and Instagrams.