To quote my late father, an Irish Tenor is a size 13 neck in a size 12 collar.

Let's just gloss over the fact that my mother's father and brother were both Irish tenors, and that *Count* John McCormack was highly regarded on their side of the family. They both sang in the choir behind him at the Mass for the Eucharistic Congress of 1932 in the Phoenix Park, though the specific light timbre of the Irish tenor voice wouldn't really come across in a choir.