What is it about those Irish singers? I think of Dolores O’Riordan of The Cranberries, who also suffered with depression.
She actually though was a fairly devout Catholic, even performed in front of the Pope.
Dolores pulled a Whitney Houston.
Alcohol
Gloomy sky
Celtic proclivity for angst and emotion
Different DNA from British Anglo Saxon and danelaw roots maybe
No question irish are different
And I say that as an ancestry.com 40% ulster Scot and regular Irish DNA person like typical southerner