I saw Yo-Yo Ma on Fox & Friends about a week or so ago. They did this then. My jaw slowly dropped open when he started playing his cello--all it did was add a woodsy-type element, IMO, to the already smokin' bluegrass. His cello is a perfect compliment to the music. Payday is Tuesday. I'll have the album that night.
When I worked at the lab, one of my co-workers was a cellist in the Albany Symphany Orchestra. Our senior PhD. nicknamed him "Yo-Yo Ma." I thought it was an insult, until I heard Yo-Yo Ma play.