Best new iOS, Android apps of Sept. 2012

Mobile apps will remain a universal obsession only as long as they continue to captivate, surprise and entertain consumers. Fortunately, the app ecosystem shows no signs of slowing up: Innovative and immersive mobile experiences are entering app stores every day. Each month, FierceMobileContent will look at the best and brightest, spotlighting the new apps that you need to download to your smartphone ASAP. Here are September's finest--the best mobile apps of the month.

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Planner Pro – Tasks, Events and Notes
John Cage Piano
The Avengers
The Room