Because we are able to hear all frequencies in the audible range simultaneously, members of a small rock band can stand out by claiming their own regions of the audible spectrum. A bass player takes the low frequencies, a drummer gets both low and high frequencies, and a guitar player claims a wide midrange of frequencies. The Beatles, while not the first rock band to employ the bass, guitar, and drums format, did much to popularize and standardize it.

Using the program GarageBand1 that is found on all Macintosh computers, I separated the frequencies of a song by the Beatles. I first produced two audio files by playing guitar parts and then created two MIDI files by transcribing the bass and drum parts from a book that provides note-by-note scores for all songs by the Beatles.2 You can similarly take apart the frequencies of any song you record....

Supplementary Material

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