| In a Century Jazz improsivations will have to be preceeded by a "streight" playing of the "standard" it is based on. This is because the public by then will have forgotten the source. This is like a theme and variations in the Serious literature. Usually a "Thema" was supplied because the public didn't know the source or because the theme was original and the listener needed to know the original features of it before it could be varied. Jazz improsivation is a variation form not very different from variation of the serious masters. As such reqular variants of the theme are played in succession although the original ideas can become quite altered. If you hear one of the lengthy famous set of variations such as the Bach Goldberg Variations or the Beethoven Diabelli Variations Op. 120, you are taken from the world of an almost forgetable theme into a wonderland of invention and in both cases ending with a variation that either is a full fugue or using fugue as a proceedure but stopping just short of making the complete form. Beethoven is famous for this, as in the Op 110 Piano Sonata in A-Flat, of reminding us that the fugue is part of something bigger, not a complete entity itself.
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