Another name that should be mentioned is Sean O Riada. In Ireland, he was composing fully orchestrated film scores with traditional -inspired music in the 1950's, and in the early sixties, helped found Ceoltoiri Chualann, the name of the group who later became The Chieftains. I was fortunate enough to hear a mass he composed performed in a church in Co. Kerry in 1989, many years after his death, during my so far only trip to Ireland. The chorus was a group of local pub singers, and it was all sung in Irish.Very poignant to hear it in that setting. He was a major influence in taking traditional music and arranging it, or composing new music inspired by tradition.