VIDEO: Imelda May belts out haunting rendition of Amhrán na bhFiann ahead of McGregor v Mayweather

There may have been some empty seats at the T Mobile Arena due to the extortionate ticket prices, but Ireland's Imelda May stirred up the atmosphere with a haunting rendition of Amhrán na bhFiann ahead of Conor McGregor's boxing match with Floyd Mayweather.