Well.. you can use an online converter to download a youtube video's audio like @Endrovy said above, or... you can use a VPN to change your location to download Spotify.
I use TubeOffline and Convert2mp3 on YouTube videos.
Because my internet connection is super slow, I specifically download/convert low-quality videos or audio-only (/Lyrics) videos.
TubeOffline also works for video downloads, but sometimes the site/source of the video(s) makes it difficult.
While Convert2mp3 often change their URL and I don't suggest google-ing it, because there are a lot of fake sites with scam ads that would show up.