iTunes is Number 2 Music Retailer in U.S.

Alongside MacBook and MacBook Pro releases today, Apple announced that iTunes had become the number 2 music retailer in the U.S., behind only Wal-Mart.

"We'd like to thank the over 50 million music lovers who have helped the iTunes Store reach this incredible milestone," said Eddy Cue, Apple's vice president of iTunes. "We continue to add great new features like iTunes Movie Rentals to give our customers even more reason to love iTunes."

The rankings are based on NPD Group's MusicWatch data. iTunes has sold over four billion songs, with 20 million songs sold on Christmas Day 2007 alone. iTunes has overtaken Best Buy which previously occupied the #2 spot.