"Macushla" is the title of an Irish song that was copyrighted in 1910, with music by Dermot Macmurrough (Harold R. White) and lyrics by Josephine V. Rowe.
The title is a transliteration of the Irish mo chuisle, meaning "my pulse" as used in the phrase a chuisle mo chroí, which means "pulse of my heart", and thus mo chuisle has come to mean "darling" or "sweetheart".
[1][2] "Macushla" became the signature tune in the 1912 musical Macushla by Chauncey Olcott.
[3] The song was recorded by a number of operatic tenors including John McCormack,[4] James McCracken,[5] Christian Ketter,[6] Kenneth McKellar and Josef Locke.
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