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Every symphony ever written has more than one key -- usually several different keys. A symphony may have the name of a certain key in its title, but this only refers to the main key that occurs throughout its structure. Each symphony will have many changes to different keys. Each symphony will tend to be unique in how it uses multiple keys. Different ...


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It's not clear what your goals and requirements are for this information system -- and that has a huge bearing on the answer. If, for example, your software is trying to analyze the harmony inside of a single piece, then yes, symphonies definitely will modulate (change keys) all over the place, as Wheat Williams describes in his excellent answer. And this ...


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A composition like "Symphony in C minor" refers to a key in the piece, with which key the composition starts and with which it ends. There is a certain number of notes and chords in that key, so if a whole composition was built only on that key, it would sound repetitive. That's why during the composition changes keys. Usually it's more than one, but it ...



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