Closely linked to harmony, tonality describes the "key" of the music. We often speak of a piece being "in the key of C major", or whatever. This is the tonality. Throughout the piece though, the tonality will change. In a piece in C major you will invariably move to different keys. The most obvious moves being to the key of F major, G major or A minor. This is particularly the case in the classical music of Mozart and Haydn.
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