To date, Apple says iTunes has 50 million customers and has sold more than 4 billion songs from a catalogue of over than 6 million choices.
iTunes, of course, sells digital downloads with both single and album options, while Wal-Mart sells physical CDs in its brick-and-mortar stores. The chain also has an online sales presence.
To get the comparison, the NPD Group's MusicWatch survey counts consumer-reported purchases and counts one CD as representing 12 tracks. The time frame covered by the latest ranking spans music sold during January and February 2008.
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