Happy ol'McWeasel is a seven-piece Irish celtic punk band that formed in Maribor, Slovenia, Europe in 2007. The band consists of Gregor Jančič (vocals), Primož Zajšek (accordion), Martin Bezjak (viola), Tine Trapečar (banjo, acoustic guitar), Aleš Pišotek (electric guitar), Bine Zorko (bass), Aleš Voglar (drums). The band has released a first single for the song Irish Rover in december 2009.