Yeah. You can search for and add any YouTube video to a playlist for YMusic. I do this all the time with various Indies, remixes, and foreign artists that are hard to find otherwise.

Yeah, I switced to YouTube music when Google Play music went away because that's where I stored all of my music at. But The category is massive, especially for niche songs and you can choose to watch the video or just listen to the song, Also with a lot of the songs you can look at the lyrics in real time while the music's playing and that's kind of nice. Also ad free YT is nice.

Did they change it? The last time I tried it said a bunch of my songs weren't available on YouTube music and I couldn't use it cause of that.