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Singer/Songwriter Rosanne Cash performs at 'An Evening with Rosanne Cash' in Los Angeles. - 

Our latest celebrity app review comes courtesy of singer-songwriter Rosanne Cash. She has an iPhone and has come to rely on a guitar tuning app called Cleartune. She says it's better than any analog tuner she's ever had. The downside is that you have to remember to turn the phone part off. Otherwise you might get in a situation like she did: a call noisily coming in during a concert.

Listen to the interview:

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