I'm not a lawyer, so I can can't give you legal advice. In general, how much you can use from song lyrics depends on things like how long the lyrics are and what portion you want to use; how old or new they are and whether they're out of copyright (or "in the public domain"); and who holds the copyright and how aggressive the holder is about protecting his or her rights.

In other words, your questions might be too complex for a comment even if I were a lawyer; there might not be "an answer" but a different one for each situation you describe. You can get more info here: https://www.nolo.com/legal-encyclopedia/question-using-portion-of-song-without-permission-28112.html