I need help using Matlab to decode a musical cryptogram.

Here is the current code. I don't understand how to make the Matlab code retrieve the .wav file. Currently, it just returns an error.

clc clear all; close all; [y,fs]=audioread('Question1.wav'); %read the sound file, y is the signal, fs is the sampling rate %construct the time vector using the sampling rate sound(y,fs); %listen to the signal. %plot the y vector to the signal that includes 20 bursts