As a follow-up guys...
Melodyne is a notoriously bad programme but many high-end DAW programmes can convert audio to midi. Most of them are fairly expensive. My son is a music producer and he does this regularly using Protools and Logic.
The key is to process one track at a time and not to try to do audio to midi of all tracks at once. However, it's not a quick process it needs a lot of work.
Probably the easiest converter at the moment is Scorecloud. Watch the video on the following page:https://scorecloud.com/
I haven't used it but I've heard it is good. I'm sure it will need quite a bit of effort though. Maybe worth a try (remember, one track at a time).
if someone tries it, send us all some feedback!