For those interested in Bach's almost mathematical structures, the Goldberg Variations will fascinate. The Aria, a Saraband, appears like two pillars at either end of the work. In between are 30 variations, grouped into 10 groups of three. Each set of 3 pieces is a free variation, a variation in duet and a canon. Thus every third piece is a canon, starting with a canon in unison (ie the canonic parts are in the same key) followed by ever increasing intervals until the 27th variation, a canon in ninth.
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