How can you use an FFT in python to detect the frequencies coming from a .wav file that is playing piano audio. For example, if 2 separate piano notes are played in the .wav file, one after the other, how can one detect the two distinct frequencies that appear when these two piano notes are heard. If there is possibly a better way determine what piano notes are being played using something other than an FFT an example of using something else would be great as well.

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