I tried to do something like that here: https://musicdocks.com/

Github: https://github.com/jantznick/youtube-spotify

It essentially uses youtube as the music source, I think I heard somewhere that playing through embedded videos skips ads but I'm not really sure, in all my time testing it I never noticed ads, but I'm also on premium so that may have been why.

by all means critique, I don't know that I have a ton of time left for it and I'm sure there's bugs here and there. I was having issues getting it to autoplay on desktop when the window itself wasn't the active tab. I never really tried it on mobile.

I was trying to get some DB of artist/song info but doing that was proving to be complicated.