MacRumors.com

NPD Group released the top leading music retailers for the first half of 2008. The list was based on purchases of CDs or digital music downloads.

1. iTunes
2. Wal-Mart (Walmart, Walmart.com, Walmart Music Downloads)
3. Best Buy (Best Buy, Bestbuy.com, Best Buy Digital Music Store)
4. Amazon (Amazon.com, AmazonMP3.com)
5. Target (Target and Target.com)

Apple's iTunes remains number one amongst all retailers. Apple took the number one spot in April, overtaking Wal-Mart.

Amazon, however, saw a rise in ranking from #5 to #4, which NPD attributes to both strong CD sales as well as Amazon's introduction of their MP3 music store. The digital rights management (DRM) free solution provides iPod users a convenient and compatible alternative to Apple's iTunes.