Ashley Duval ('10 MESc) plays on Late Night with David Letterman.

How cool is the F&ES community? Here’s how cool: That was Ashley DuVal (’10 MESc), research assistant to Dean Peter Crane, blasting the trumpet with hiphop supergroup Deltron 3030 on “The Late Show with David Letterman” Tuesday night.

DuVal, who earned extra money performing in South Pacific on Broadway while she was a student at F&ES, was recruited by a friend and longtime collaborator to play a handful of East Coast shows with the band this month, culminating with a “Late Night” performance before a television audience of roughly 3 million people.

“I joked with my husband, ‘I’m just going to try not to fall off the stage,” she said. “And then I got there and realized it was a real risk because they had us on these…