Questions about example sentences with, and the definition and usage of "Nao"

A: I don't know what it is.

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A: I don't know

A: First of all:

"Nao has Music (missing) at 5:00 and Mint hasTaekwondo."
Music (missing) could either be Music lessons or Music classes. "Music lessons" sounds better.

But this sounds more natural:

"Nao has Music lessons while Mint has Taekwondo at 5:00."
or
"Nao has Music lessons while Mint has Taekwondo classes at 5:00."

I would prefer the last though.