Pitlochry festival theatre This stripped-down show with a maudlin set of songs makes for the most reluctant of musicals, but this is a production that has the confidence to be silent or stately When Once opened on Broadway in 2012, later to enjoy a run in London’s West End , it was greeted with a degree of surprise. You can see why. In terms of the Great White Way, it is an anti-musical. Based on the 2007 film by John Carney , with a book by Enda Walsh and songs by Glen Hansard and Markéta Irglo