Steve, in regard to Fair Use, that is more easily justified in education, just as you mention about discussion and comparison here for the purposes of learning. Fair Use is normally limited to a one-time use, and in the case of books or articles, to an excerpt. I'm not sure how that applies to songs, since as academic dean I never ran into that case, but I would think to be safe the same ideas would apply. When in doubt, you can write to the publisher to get permission for what you plan to do.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.