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As the lead singer with the Capitol Showband, he rivalled the Royal Showband's Brendan Bowyer as Ireland's most popular showband vocalist.
Brendan Bowyer, Tom Dunphy and the Royal Showband from Waterford toured professionally around 1958, and became a crowd-drawing success.
O'Brien is the niece of Brendan Bowyer of The Royal Showband and the great-greatgrandaughter of Albert Bowyer of the Bowyer/Westwood Opera Company of Blackpool, England.