How do you download your music to a MP3 player

Ask the manufacturer of the device. That's not an Apple product.

B2354 wrote:

How do do download your music from your iPhone to your MacBook Air.

Thanks

You don't.

You can re-download any purchased music from the iTunes Store to iTunes on your MacBook Air at no charge. Anything else should already be in the iTunes library on your computer.

B2354 Said:

"How do you download your music to an MP3 player?: None of my old songs are in the music folder"

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Search for them:

1. Go to: File menu
2. Select: Import...
3. Use: the Search Box on the top-right corner of the window

B2354 Said:

"How do you download your music to an MP3 player?: I cannot see it."

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Perform this in Music: click "This Mac" on the top-left, and type "mp3" on the top-right:

Screenshot of what I see:

From what?

Where is your music stored? What kind of MP3 player did you have in mind?

B2354 wrote:

I just downloaded Big Sur. It didn’t download my iTunes.

Yes it did, but it’s now called Music.