Spotify in-game

No, this is not a wish or idea. Because I'm quite certain that for some reason the in-game stereo is sometimes playing music from my Spotify playlists. Especially the one with 80s and 90s music. Why am I certain? Because I haven't added that music to the files. I don't even have them on my computer, that's what's Spotify is for - streaming music. And Yes, I'm certain it's music from my playlist. They sing in English, not similish.

I don't mind, it's rather nice just...odd and I have no idea why. Someone else who have noticed this?