A man painted green takes part in a Beltane May Day celebration on May 1, 2013 in Glastonbury, England. Matt Cardy/Getty Images hide caption

Hear piano music from Antoni O'Breskey in this hour of The Thistle and Shamrock. Courtesy of the artist hide caption

Hear Altan's "Gweebarra Bridge" in this week's Thistle & Shamrock. Colm Hogan/Courtesy of the artist hide caption

Hear music from Battlefield Band in this week's episode. John Slavin/Courtesy of the artist hide caption

Hear new music by Molly's Revenge in this week's episode. Rick Ahern/Courtesy of the artist hide caption

Joe Craven's "Soldiers of Joy" kicks off this week's show. Courtesy of the artist hide caption

Maggie MacInnes. John Slavin/Courtesy of the artist hide caption

Melody Grove stars in The Strange Undoing Of Prudencia Hart, the focus of this week's episode. Jenny Anders/Courtesy of the artist hide caption

Jean Ritchie. Courtesy of Compass Records hide caption

Fiona Ritchie presents a set by traditional Irish band The Chieftains on this week's show. Courtesy of the artist hide caption

Hear music from Goitse on this week's episode of The Thistle & Shamrock. Courtesy of the artist hide caption

Robin Huw Bowen. Courtesy of the artist hide caption

Brian McNeill. Courtesy of the artist hide caption

Mary Jane Lamond and Wendy MacIsaac. Riley Smith/Courtesy of the artist hide caption

Tony McManus is one of the artists featured on this week's show. Courtesy of the artist hide caption

This week's episode features music from The Katie McNally Trio. Courtesy of the artist hide caption

Scottish bard Robert Burns. Flickr hide caption

This week's episode features music from American fiddler Eileen Ivers. Mel DiGiacomo/Courtesy of the artist hide caption

Hear an extended medley of tunes performed by Kevin Burke in this week's show. Courtesy of the artist hide caption

Liz Carroll and John Doyle are among the artists who take inspiration from the heavens on this week's episode of The Thistle & Shamrock. Courtesy of the artist hide caption

Hear music from Irish singer Niamh Parsons in this week's episode. Courtesy of the artist hide caption

Jennifer Cutting's Ocean Orchestra. John Aikins/Courtesy of the artist hide caption