Apple CEO Steve Jobs today announced during his keynote speech at the Macworld Expo in San Francisco that the Cupertino-based company is the fifth largest music reseller in the U.S., selling more music than Amazon.com. The company has sold more than 2 billion songs through its iTunes Music Store, with iTunes sales still rising this year. Apple sold the second billion songs in 10 months, and Jobs "couldn't be happier" with the growth rate of iTunes. The store is selling 5 million songs per day, or 58 songs per second. Additionally, Jobs discussed the iPod nano as being the most popular MP3 player, and that the second-generation iPod shuffle is the most "wearable" player on the market.