How to recognize the frequency of a sound (note) in C#?

Question

C++ / C#

Hello!
I want to create an application that takes an audio recording / melody as input and outputs the notes that the program was able to "hear".
How can this idea be realized?
Thanks

Answer 1

Use the Fourier transform to get the spectrum of the record. Then analyze the spectrum for the presence of harmonic notes.

Answer 2

Use, for example, this library. Or right away in C#.