According to Billboard, iTunes’ share of all US music sales for 2009 was at 26%, up more than 5% from 2008. This gives it an even bigger lead over the number 2 seller, Walmart (iTunes knocked Walmart out of the top spot in 2008). Walmart’s sales are now at 12.5%, down from 15%. Walmart and Best Buy combined don’t add up to iTunes’ share.

One factor in this, obviously, is the shift away from physical formats like CDs. In 2009, all digital sales accounted for 50.7% of music sales (up from 42.5% in 2008). If the other music download companies don’t get a major share of new accounts, Apple will completely dominate the music industry like no one else ever has. In a few more years digital sales will be the sales that matter, and iTunes accounts for more of those than all other companies combined.