What's the meaning that "Rock ain't #1 about doing things perfect."?

Question

I'd like to know what the underlined ,bold two lines mean exactly. I can't see each meaning of about in those lines.
I guess #1 and #2 are used as different meanings.
Am I right? So, I need to your help that will make the underlined sentenses more easier lines for my better understandings.

---------The lines go in the movie, "The School of Rock"

-All right. Everybody, class has begun.
And you know what?
You guys have been doing real good in here.
If I was gonna give you a grade,
I'd give you an A.
But that's the problem.
Rock ain't #1 about doing things perfect.
Who can tell me what it's really about #2?
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One more things
Please my sentenses for my better English compositions.

Avangi · Accepted Answer

ljswaveRock ain't #1 about doing things perfect.

This sounds very casual to me.

"Rock" is a school, or possibly a way of life.
A school teaches people how to do things. That's what "they're" about. That's what they do.
Do they teach people how to do things perfectly? No. That's not their objective.
That's not what they're about. (That's not what the school is about.)
When it comes to doing things perfectly, they're not at the top of the list. They're not #1.
They rank somewhere way down the list.

What's the meaning that "Rock ain't #1 about doing things perfect."?

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