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I can't say I know if there is such an app, but why would you want to do this ?
because i use my iphone as the centre of a little hifi system i have and it would be nice to not have to get up and choose the song i want.
basically just out of laziness.
the remote app isnt really that useful for me at the minute, but when i have sorted out my AV area then it will be useful as my macbook pro will be the center of it all.