What URL Structure For My Guitar Lesson Site?

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Premio: $10
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Ganador: almumin

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Resumen del concurso

I want to know the best way to structure my URLs (for users and SEO) on my guitar lesson site, https://davesguitarplanet.com. Whoever gives the best answer wins the contest! You should write good, complete English sentences with a full (but concise), argument.

My site’s main menu contains: Home, Lessons (submenu: Beginning, Intermediate, Advanced, Soloing), Songs (submenu: Song Lessons by Type, Lyrics (PDF)), Resources (submenu: PDFs, Backing Tracks), Misc (external links, ‘guitar stories’), About, Contact.

Here’s the main question:
For my lesson pages, which URL structure do you think is best? (I'll use the lesson on "Let It Be" as an example.)

1) davesguitarplanet.com/let-it-be/

2) davesguitarplanet.com/beginning/let-it-be/

3) davesguitarplanet.com/lessons/beginning/let-it-be/

or with dashes?:

4) davesguitarplanet.com/beginning-lessons/let-it-be/

5) other?

If you think one is better than the others, why? Or, do you think it doesn't really matter? (Opinion seems to differ on the web.)

If you chose #3 or #4, then obviously I would follow this structure with intermediate and advanced lessons. But, also with songs/song-lessons-by-type, resources/pdfs, etc.?

Would you stop at 2 subdirectories? (I could make, for example, lessons/beginning/rock, lessons/intermediate/country, etc.)

Some big players in my niche seem to use subfolders, but just one or two levels:
example.com/free-lessons/beginner/beg_04/
example.com/guitar-lessons/how-to-practice-scales-sc-102
example.com/jazz-blues-guitar-lessons/trading-solos-frank-vignola/c1425

Thanks, and good luck!