Composer William Brittelle joined John for a Mystery Train Sunday Service on RTÉ lyric fm to talk about his music and musical influences - listen above.

His latest release Spiritual America is described as 'a genre-fluid electro-acoustic song cycle' and music choices include Prince (there's a great story relating to that one), Bon Iver and Whitesnake.

Mystery Train, RTÉ lyric fm, Sunday to Thursday, 7 - 9pm - listen back here.