On Sunday's edition of Mystery Train on RTÉ lyric fm, John Kelly was joined on the train by Roger Doyle, also known as the Godfather of Irish Electronica, for a whistle-stop tour of music over the past 100 or so years from Debussy and Stravinsky, through Beach Boys harmonies, via Prog Rock, Post Rock and even Math Rock, through Zappa and landing, logically, on Sia.