Source : ARS Technica via Apple PRYesterday Apple announced that iTunes is now the #1 music retailer in the United States, based on sales in January and February 2008. iTunes has managed to capture a 19% percent market share, beating Wal-Mart's 15%, and Best Buy's 13%. This is the first time a purely digital retailer has surpassed brick-and-mortar music sales. This has been quite a jump for Apple, who only just passed Amazon's market share values in July of 2007. This upward trend of digital sales is sure to stay, as is the drop in the sales of physical media.