To acquire YouTube Content ID, the material must be 100% your own. Therefore, beats and loops that are non-exclusive may not be considered your own and can not be provided with Content ID. This includes all copyright free sounds, since if Content ID is provided, other artists' tracks that have used the same sounds will also be claimed.
These are the requirements for Content ID:
Only original music with all sounds recorded by you, or which you have an exclusive license to use (meaning no one else will use those sounds in their tracks)
No beats or instrumentals that have previously been, or are currently available for licensing by other artists
No beats, loops or sound effects downloaded from sample libraries. This includes any free sounds included in Logic, Pro Tools, Garage Band etc.
No samples from other songs, movies, TV shows, podcasts, video games, YouTube videos etc
No public domain recordings/songs
No remixes/mashups or medleys
No alternative versions (Live, Remastered, Acoustic, Instrumental etc.)
No soundtracks/scores or stock/production music
No nature sounds, ASMR, educational content, meditation, prayers or church services, speeches, audio books or other content that isn't original commercial music
Even if it's legal for you to use these sounds, it's not possible to add Content ID to any tracks including any of these things.
We know this may seem like a lot of rules, but it's just to make sure that the YouTube Content ID system works properly and claims the correct content. Also, incorrect claiming may lead to legal consequences for the user, so we make sure to only add Content ID to tracks which are eligible for it.