As far as I know, Jean-Baptiste Joseph Fourier never took an interest in birds, but he was a legendary mathematician who’s work enabled our modern techniques for digital audio. Fourier discovered a mathematical transformation that converts a time signal into a frequency signal. This would let us, for example, record a finch’s birdsong and decompose it to find the major frequencies. This would be useful for compressing the audio file. By studying the anatomy of the ear, you can throw away all the frequencies that the ear wouldn’t hear anyway.