The dubliners recorded seven drunken nights, AND IN MY OPINION this is an example of a song that became a hit, that was not altered significantly to be commercially successful,MERELY [PUTTING BOTH SIDES OF THE COIN.
If i remember correctly, shoals of herring[contemporary song , but traditional sounding reached number 8 in the hit parade in early sixties but was not altered significantly or in a commercial way from how it was presented on the radio ballads.