I have developed a decent idea why Youtube suggested them to me. Recently, I posted a song from Toots & The Maytals. Youtube remembered that and suggested Bob Marley & the Wailers. I took that suggestion and then it suggested some Ska. I went with that and it suggested Mighty Mighty Bosstones. So my recent search for Toots & The Maytals eventually had me end up with a song that you liked. I don't use Spotify, but am under the impression that they are even better than Youtube at suggesting the Right music for a person.