To some, this analysis of music and society may seem no less far-fetched than Plato's.

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Born in 1931 and brought up by his mother in Stockholm, he learned piano as a boy, and his poems match the virtues of music to the virtues of psychological analysis.

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Westergren says the company spent the first 4-5 years of its corporate life building the music analysis software that it at the core of the Pandora service.

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In June, the analysis firm NPD reported that iPods have about 73% of the digital music player market, with Zunes accounting for 2%.

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