Diana Deutsch is a Professor of Psychology who specialises in perception of sound and music. For example, she's studied how left and right-handed people hear sound differently. If you listen to the sound files on this page, and you're right handed, she would expect you to hear most of the higher-pitched bleeps in the right ear. Flip your headphones round, and see if the higher pitches move. Listen to the two channels seperately, and they're identical arpeggios. Apparently if you're left handed, you'll hear the higher notes on the left. Worked for me, anyway. This, she suggests, is why the more high-pitched instruments are on the right hand side of the orchestra (and the piano keyboard). More like this on her albums. (Thanks, Mikey)