Dundalk brothers Charles and Andrew Hendy have been charming audiences in their guise as hip-hop duo TPM since 2015, with a run of hilarious but infectious singles about life on the dole, their love of curry sauce and their hatred of the national broadcaster. But their more recent reinvention as stout-swilling folk band The Mary Wallopers, with friend Seán McKenna in tow, came as something of a surprise. Armed with guitars, banjos and a seemingly bottomless well of traditional folk ballads, the trio have supported the likes of Lankum and Junior Brother, as well as playing their own riotous and…