YouTube Music is not the same thing as YouTube Content ID.
For clarification purposes, it's important to define the difference:
YouTube Music (Formerly YouTube Red): This is YouTube's streaming music platform that competes with other streaming services such as Spotify, Apple Music, etc. When we deliver our artist's and label's albums to this platform, YouTube creates what are known as "Art Tracks" for each of the songs on the album. An Art Track is simply a video on YouTube that plays the song and displays the album's cover art, title and artist name. When a user watches/plays one of your Art Tracks, they are served an advertisement during the video which allows the view to be monetized. Alternatively, paid subscribers to YouTube Music will not see any ads for Art Tracks in YouTube and money is earned based on the industry standard pro-rata share of subscription revenue.
YouTube Content ID: This is YouTube's service that scans YouTube's entire library of user uploaded videos and searches for any videos in their platform that are using a specific song. This unique service allows Catapult to monetize user uploaded videos by ads being served alongside the video.