Board Thread:Support Requests - Community Management/@comment-5003660-20150403033934/@comment-1038387-20150403165354

Fair use (roughly summarized) means it serves an educational/informational purpose and no non-free example is available. If you plan to use it, you have to use it on a relevant page - a page about the song, for example. Fair use is a tricky concept, and while you can claim the use is fair, the copyright holder might disagree, and that trumps you.

In reality, few bother and you can get away with a lot. Doesn't mean you should, but you can.

For more info about how to add YouTube videos, see the Help page on Embedding. Actually uploading videos is only possible for .ogv files.