Amazon.com (AMZN -1.64%) has stepped up its moves in the battle to win the mobile audio war. The online company announced today that Apple (AAPL 1.27%) iPhone, iPad, and iPod touch users can now purchase Amazon music directly from their devices.

This newest upgrade allows Apple users to search the store's 22-million song catalog, purchase music, and have it automatically stored on Amazon's Cloud Player for future playback or download.

Amazon says customers have requested such convenience. "For the first time ever, iOS users have a way do that -- now they can access Amazon's huge catalog of music, features like personalized recommendations, deals like albums for $5, songs for $0.69, and they can buy their music once and use it everywhere," said Amazon Music VP Steve Boom in a statement.

The feature is now available on Apple devices as well as the Kindle Fire, Android phone and tablet, Roku, Sonos home entertainment system, and most other Web browsers.

According to Amazon's latest quarterly statement, media made up 33% of total sales and grew 11% compared to Q3 2011.

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