Apple’s iTunes remains number one in the U.S. amongst all music retailers according to the latest NPD MusicWatch figures. Based on purchases of CDs and a-la-carte digital music downloads from January through to June of this year, the league table is as follows:

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)

NPD says the results reflect “the ongoing consumer shift from physical CDs to digital music”, which has helped iTunes to consolidate the lead it established earlier this year.

See also: Review: Amazon MP3 offers compelling, promising alternative to iTunes

Most notably, Amazon has moved from fifth place to fourth, which NPD attributes to stronger CD sales online compared to competing brick-and-mortar stores, along with the launch of the company’s own music download store, AmazonMP3, last year. As a result, we shouldn’t be surprised to see Amazon overtake Best Buy in the not too distant future.