Here's a clip of Matt Malloy playing with The Chieftains, regarded by many as arguably the finest Irish flutist in the world. The solo portion of this clip demonstrates the man's almost super-human abilities.
Punchline comes after the tune is finished and Paddy Moloney, the groups piper and leader, says "Yes. Not bad. Not bad at all."
And yes, that shot of the guy backstage is indeed Roger Daltrey, who was waiting in the wings to perform a song with them.