Correlation Coefficients Using .Wav Files for x,y,z

I would like to know how to use the function listed below correctly with 3 different .wav files. The files are in matlab using wavread. I am confused as to how to make these three variables x,y,z = the wav files 1,2,3. I want the entire spectrum of 1 wav file to equal each variable for analysis.

cxy=corr2(x,y), cxz=corr2(x,z), cyz=corr2(x,z)

Here is the first part of the script

dir1=uigetdir cd(dir1);

[name1,path1]=uigetfile('*.wav','SelectWAV File'); [x,fs]=wavread(name1);

L=length(x); t=[0:L-1]'./fs;