From Billboard (magazine), Vol 80, No 8, Feb 24 1968, page 44:

Both sides of Johnny McEvoy's new single which he launched on "The Late, Late Show," have theatrical connections. "Nora" is from Sean O'Casey's "The Plough and the Stars"; "Tarry Flynn," penned by local folksinger Shay Healy, was inspired by the P. J. O'Connor play based on the late Patrick Kavanagh's novel of that name.