Peyton Manning may be the best quarterback in NFL history (we're not here to argue about sports statistics, so save your playoff performance arguments for ESPN.com), but he sure ain't the best vocalist in NFL history. He wasn't quite up to Terry Bradshaw-levels of performance while performing Johnny Cash's "Folsom Prison Blues" with Dierks Bentley over the weekend.

The clip that escaped to the internet this week was only 15 seconds long but it gives fans all the information they needed. Manning appears alongside Bentley, clearly looking at a teleprompter to remind him of the lyrics to the Cash classic. And while his monotone drawl has always endeared him to fans and reporters in an "aw, shucks" sense, it's not much of a surprise that he struggles to stay in tune during the performance.

We shouldn't give Manning too tough of a time however. After all, the performance was from his annual charity event raising funds for the Indianapolis Children's Hospital, where Bentley was the headline performer this year. Manning could get up there and attempt rapping "Straight Outta Compton" and we'd be cool with it...because it's for the kids. If anything, the city of Indianapolis is praising the heavens that Manning has kept up with his benefit despite being traded to the Denver Broncos several seasons ago.

While they might not share a delightful singing voice, both Manning and Cash share a connection with and owe the great state of Tennessee for kickstarting their ultimately prosperous careers. Cash got his start as a performer with Sun Records, based out of Memphis, and Manning excelled as as a four-year starter at the University of Tennessee.

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