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40 Lessons in how to correctly play improvisations.

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Fundamental Discords. The Dominant Seventh 39
It will be clear that in every place where a dominant chord has hitherto been used it will be possible to substitute a dominant seventh. This chord is used with great fre­quency by the classical composers; instances of its use abound on every page of their works; e.g.,
45                                    Haydn
Especially is it used at the perfect cadence, and it is difficult to find a case in the writings of the standard com­posers where it is not here inserted. The student may conclude from this that he ought to aim at including the seventh in all his perfect cadences. He should, however, be careful to exclude the seventh from the dominant chord when this is used for the semi-cadence. Its use here is rare, and unsatisfactory, since it takes away from the desired sensation of repose.
Exercise 14.
(a)   Play and resolve the dominant seventh normally in every major key, according to the specimens given above.
(b)   Do the same in every minor key.
(c)   Give deceptive resolutions in every major, and every minor key, as shown above.
(d)   Invent many periods, using the dominant seventh, especially for the perfect cadence.
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