Write a function that will accept a string specifying a sound file and do the following:
a. Play back the sound.
b. Plot the sound in the time domain, titling and labeling your plot appropriately.
c. Compute the frequency with the most energy in this file. Validate your answer by plotting the lower quarter of the frequencies of the Fourier transform of the sound. Don't forget that the Fourier Transform is complex; you will need to reason with and plot the absolute value of the spectrum.
d. Test this function with suitable .wav files.