Sean Potts, a founding member...

...of the traditional Irish band the Chieftains, died at age 83. Here's a little sample of his music just in time for St. Patrick's Day. That's Potts on the right, playing the tin whistle and later speaking in ... Gaelic?

From Potts's obit in the New York Times:

Over the next 15 years or so, the Chieftains moved from small stages in Ireland to touring the United States. They eventually signed with Island Records and established themselves, counter-intuitively, as crossover artists, sometimes performing with rock groups, including the Grateful Dead. 

The Chieftains performed with the Dead?