Spotify does provide an API. I've used it with various command-line clients on a headless linux box. For example, https://mopidy.com/ https://mopidy.com/ Ther

Spotify does provide an API. I've used it with various command-line clients on a headless linux box. For example, https://mopidy.com/ https://mopidy.com/ There is even a foobar2000 spotify component, though I haven't used foobar2000 in a long time, so cannot vouch for its quality.