This is one of the best-selling hits with a reggae influence, and depending on your definition of ska, could be considered the first hit in that genre. Ska developed in Jamaica as a hybrid of American R&B and Caribbean music, and Small's producer Chris Blackwell helped bring the sound to England and America with his Island label.
In England, ska was an easier sell because of the large Jamaican population, and artists like Prince Buster and Jimmy Cliff caught on in the '60s. In America, the sound was mostly novelty, and the next hit single in that style was The Israelites
by Desmond Dekker & the Aces in 1969. America didn't really warm to ska until the '90s, but in the UK groups like Madness and The Specials were big during the 2 Tone era of the '70s and '80s.