I am looking for a high level audio crate library that allows me to easily get various information about an audio such as its sound, tempo, current key/pitch etc?
Sound doesn't generally have keys, tempos, and pitches. Those are properties of music that require a complex set of assumptions, such as knowledge about what instruments are being played, models of how they operate, and the environment they are being played in.
However, if you're talking about a specific format such as MIDI (or sounds generated with a known profile), you're going to have a much easier time finding this sort of thing.
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