I'm guessing many (lazy) students etc use Chat GPT to try to help with essay writing and their course work.
Beyond that I wouldn't see why anyone would trust it with anything.
And I know for a fact Open AI uses non relational indexing.
So far much of AI is totally useless anyway how it's implemented when you don't (want to) follow companies' "orders".
I got surprised by the harmony, melody, rhythm and catching chorus delivered by Suno AI. Felt inspired by the songs' vibe in a way I can't feel inspired by modern songs people create nowadays.
Since you are talking about 80's songs, you might would like to check: https://www.youtube.com/watch?v=kZidtDpxRok
ChatGPT is really limited, though. Asked for obscure, unknown 80's hits suggestions, but it keeps showing the popular ones.