The music was adapted by Houston Collisson (1865–1920) from the traditional Irish folk tune "Carrigdonn" or "Carrigdhoun".
The Mourne Mountains of the title are located in County Down in Northern Ireland.
The song is a whimsical look at the styles, attitudes and fashions of late nineteenth-century London as seen from the point of view of an emigrant labourer from a village near the Mourne Mountains.
The "sweep down to the sea" refrain was inspired by the view of the mountains from Skerries in north County Dublin.
[3] It contrasts the artificial attractions of the city with the more natural beauty of his homeland.