Moore was born in Newbridge, County Kildare, Ireland and attended Newbridge College. He was originally a bank employee who wanted to express himself using traditional music. During a bank strike in 1966, which lasted twelve weeks, he went to England, as many striking officials did, but didn’t return when the strike was settled. “I had a wild and wonderful time in England, with no bank manager looking over my shoulder,” he said. Doing general labouring work, he frequented the folk clubs and the Irish music pubs where he met Seamus Ennis, Margaret Barry, Luke Kelly, Martin Byrnes and many other traditional musicians. When Irish singing trio The Grehan Sisters, with whom Moore was previously acquainted, moved to the north of England from Dublin in 1967, they assisted Moore to get a higher profile by giving him contacts and support slots on their concerts.