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Polytonality in Aaron Copland's Sextet for Straing Quartet, Clarinet, and Piano (p.23).

[edit] Source

Marquis, G. Welton (1964). Twentieth Century Music Idioms. Englewood Cliffs, New Jersey: Prentice-Hall, Inc.

[edit] Copyright

This work is copyrighted and unlicensed. It does not fall into one of the blanket acceptable non-free content categories listed at Wikipedia:Non-free content#Images or Wikipedia:Non-free content#Audio clips. However, it is believed that the use of this work in the article "Polytonality" :

To illustrate the subject in question
Where no free equivalent is available or could be created that would adequately give the same information
On the English-language Wikipedia, hosted on servers in the United States by the non-profit Wikimedia Foundation ([1]),

qualifies as fair use under United States copyright law. Any other uses of this image, on Wikipedia or elsewhere, may be copyright infringement. See Wikipedia:Non-free content and Wikipedia:Copyrights.

To the uploader: this tag is not a sufficient claim of fair use. You must also include the source of the work, all available copyright information, and a detailed non-free use rationale.

[edit] Fair use for Polytonality

The image linked here is claimed to be used under fair use as:

it is a very short portion of one part of the entire piece;
the transcription is only being used for informational purposes;
it is inferior to the original piece;
Its inclusion in the article adds significantly to the article because it provides an example of polytonality.