I noticed some ska mentioned early on, but no reggae or rocksteady. My nominations are:
Desmond Dekker - Israelites
Toots and the Maytals - 54-46 That’s My Number
I know the understanding is only English-language pop songs will be mentioned, BUT if anyone is curious about pop music in other languages may I humbly suggest:
Sarah Brightman and Andrea Bocelli - Time To Say Goodbye. (English and Italian)
Indochine - Dizzidence Politik (French New Wave)
Elba Ramalho - Coração Brasileiro (Brazilian Portuguese, anything from this same album is a pop song winner)
And an old favorite from way back:
The Singing Nun - Dominique (French)