This musical celebration charts the lives and careers of some of the biggest selling acts in Irish rock, punk and pop from Van Morrison and Thin Lizzy to The Undertones and U2. From the pioneers of the showbands touring in the late 50s through to the modern day, the film examines their lineage and connections and how the hardcore, rocking sound of Belfast merged with the more melodic, folky Dublin tradition to form what we now recognise as Irish rock and pop.