• by Sarah Mahoney  @mahoney_sarah, May 26, 2010

Amazon leapt three percentage points to tie Walmart for second place in online music sales last quarter, reports NPD Group, with market leader iTunes strengthening its dominant share.

Overall, digital tracks and albums accounted for 40% of the overall music market share in the first quarter, a gain of 5 percentage points from last year’s first quarter. Some 28% of all music purchased online in the U.S. was through iTunes, up four percentage points; with Amazon gaining three points to tie Walmart at 12%.