is there any Framework to implement a spectrum analyzer? [closed]

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I want to Implement the Music Tracker as like below image.

I want to implement it in to the iphone. So is there any Music API or any Sound Library available to implement it in to iPhone ?? Please help me regarding this.

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This isn't a 'tracker', but is a visual representation of the frequency domain for a given time period during playback.

You'll need a library that can do Fast Fourier Transforms (FFT) such as this.