Apple now holds a 19 percent share of the U.S. music market, beating Wal-Mart's 15 percent and taking the No. 1 spot for the first time. Just last month, Apple moved past Best Buy for the No. 2 spot. The data, from an NPD survey, came from a leaked internal email from Apple. Ars Technica suspects the increase in buying is related to Christmas gifts of iPods and iTunes gift cards. Most surprising to me? People still buy music.