Ronnie Dunn was a member of the really successful late 90s/ early 2000s duo Brooks & Dunn.
He's solo now. He performed with Taylor at a Nashville date of the Speak Now tour.
I think he's pretty well respected in the industry.
They're also where this iconic performance came from
Fearless era could've pulled off six singles, but she was definitely being overexposed at that point so five probably would've been best. You're Not Sorry and Forever & Always tbh. She may have been 7x platinum by now -_-