None of my original tracks are under public domain or a Creative Commons licence. This generally means that you require a permission to use them in any context.
If you have received permission from me and receive ContentID claims on your videos using my music, send me the URLs of any affected videos and I will clear the claims as soon as possible!
If you don't have a permission and ContentID discovers your YouTube channel using my music, you will not receive a copyright strike. Instead, advertisements will be put on your video. If you are okay with supporting me this way, then you don't need a licence (for YouTube use). Crediting and linking is still required!