"About" and "on"

[Scopel]

There is a song named "About a Girl" by Nirvana. I see this "about" as having the same meaning of the title of John Keynes' book "Treatise on Money".

I wish to know when to use "about" and "on" in the meaning of this cases.

For me it's not obvious.

[Beeesneees]

Hi Scopel,

In the examples you have provided, the terms are interchangeable.
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