I regulary use youtube to hunt for niche tracks, and it still happens that those tracks can't be found on spotify (though spotify got vastly better with not-so-

I regulary use youtube to hunt for niche tracks, and it still happens that those tracks can't be found on spotify (though spotify got vastly better with not-so-popular music in the last 6 months or so). Youtubes never recommends mainstream music to me, I guess it depends on the browsing history of your account (and IP address etc.)