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40 Lessons in how to correctly play improvisations.

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It is a general principle that any voice may move along any chord-line; therefore, when the dominant seventh-chord is repeated, or merely sustained, the part taking the 7th may move freely.
The question then arises: is this movement to be up or down? If downwards, then the movement is unrestricted, since the interval of the seventh always has a downward tendency. If, however, the movement is upwards, the matter is different. The rise of the seventh is unnatural, therefore difficult and unlikely. When the seventh pro­gresses along its own chord-line it may move down as follows:
and proceed freely.
If it is taken upwards, it may only go one step, and must then return, e.g., 47
or if resolving,
This progression really comes logically under the head­ing of a neighbour, taken in the first case normally and in the second by elision.
When the seventh disappears from the part in which it is first heard it usually reappears in another voice. This may be either immediately, or at a short interval. In the following cases it does not reappear, but is resolved 'ornamentally.'
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E-Book - An Annotated Compendium of Old Time American Songs by James Alverson III