Whats next after FFT? signal comparison

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Phantom.i7
Phantom.i7 le 5 Mar 2014
Hi i want to compare two signals one is record the other will be played then recorded.
recObj = audiorecorder;
disp('Start speaking.')
recordblocking(recObj, 4);
disp('End of Recording.');
myRecording = getaudiodata(recObj);
wavwrite(myRecording,'chordread.wav');
[x, Fs] = wavread('chordread.wav');
[x1, Fs1] = wavread('chordA.wav');
Y = fft(x);
Z = fft(x1);
now I have the data Y and Z how can i compare them? i wanna know if the input signal is chord A of a guitar...

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