FFTea is a real time high resolution spectrum analyser for MacOS X. It was born as a debugging tool for a sound driver, then it degenerated into something that eats enough CPU, memory and graphic card power to be worthy of release to the unsuspecting world.
It is a surprisingly interesting way to "look" at music, you can see the tempo, melody, bass lines, various instruments (and their harmonics) and balance just at a glance. In fact with little training you can read very interesting things in there. It's also an invaluable tool to pick out stray frequencies, noise sources, clicks and artefacts from a mix.

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