[bena]

Like most things, it depends.

If I recite them to myself, in my home, it's fine. If I do it at a gathering at my house where we're playing D&D, fine. If I do it as a performance, in front of a crowd, or as a recording, now I'm no longer fine. Context matters in a copyright cases. Not to mention, to claim fair use, you do have to claim you violated copyright. Fair use is just an allowed violation.

As to Happy Birthday, that's actually ok for them to do now. The person/group that held the copyright to Happy Birthday was found to have not actually have held them in the first place. Happy Birthday is actually an older song called "Good Morning to All". Swap "Good Morning" with "Happy Birthday" and "children" with "dear [PERSON]" and you have the lyrics. This was not deemed a substantive change. And since the copyright on "Good Morning to All" has lapsed, Happy Birthday is in the public domain.