I have the 2 sentences.
We're not allowed to give out the personal information "about" our customers.
Please submit the tape "on" the American English Pronunciation.
I don't know when to use "on" and "about" in the sentences like this.
a book for children about Africa and its people
a textbook on Africa history
a conversation about money
a lecture on economics
We use about to talk about ordinary, more general kinds of communication.
On suggests that a book, talk etc is more serious, suitable for specialists.