YouTube Music will feature everything you expect from a streaming music service, including millions of songs, albums, thousands of playlists and artist-based radio. Its major differentiator from YouTube is YouTube's catalog of remixes, live performances, covers and music videos that aren't on other platforms.
You can publish your music on this platform (in both the Basic and PRO plan), just make sure you select YouTube Music when planning your release.
If you haven't upgraded your artist YouTube channel to an official artist channel then YouTube will post your music on what is called a Topic Channel.
Many artists are automatically assigned a topic channel. A topic channel usually displays your name, followed by “-Topic”. For example, Drake - Topic. Note that this a different channel than his Official Artist Channel, Drake. Both of those channels contain his music. If you do not claim your Official Artist Channel, fans will be directed to your Topic Channel on YouTube.
Various Artists - Topic
Many times, YouTube adds artists' music to a channel called "Various Artists - Topic". This is usually for undiscovered artists with smaller play counts. When an artist becomes more popular, their music is often moved (by YouTube) to a hashtag channel.