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Charting the mytunes revolution

It's taken decades of technology breakthroughs to get from 8-tracks to iPods. Digital downloads still represent just a fraction of total music sales, but CD sales have slid steadily since their introduction. Fortune looks at how the way we listen to music has changed over the years.

By Doris Burke

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1973 total sales: $9,156.1 million

Bestseller: The World is a Ghetto

War

	LPs	$6,519.9 million
	8-TRACK TAPES	$2,220.2 million
	CASSETTE TAPES	$345.1 million
	COMPACT DISCS	N/A
	MP3 DOWNLOADS	N/A

Sources: RIAA, Billboard. All figures in 2007 dollars.
Sales for LPs, cassettes, and CDs include singles
Some music formats are omitted

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