An article in the german "Spiegel" talks about Jason Brown who uses mathematics to analyze music, like the work of the Beatles. Here is an article of Brown. You can do this yourself, for example with Mathematica. Here are the first 6 seconds of the song "Hard days night" in Wav format. And here is how you can import that into Mathematica: 
A=Import["harddaysnight.wav"];
L=A[[1,1,1]]; R=A[[1,1,2]];
Now L are the sampled values of the left sound track.
And here is the Spiegel article: