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|Tuning=7L 3s<15/7>}}
|Tuning=7L 3s<15/7>}}


'''7L 3s<15/7>''' refers to the structure of [[MOSScales|moment of symmetry scales]] built from a 10-tone chain of major thirds:
{{MOS intro|Scale Signature=7L 3s<15/7>}}
 
L s L L L s L L s L


Graham Breed has a [http://x31eq.com/7plus3.htm page on his website] dedicated to 7+3 scales. He proposes calling the large step "t" for "tone", lowercase because the large step is a narrow neutral tone, and the small step "q" for "quartertone", because the small step is often close to a quartertone. (Note that the small step is not a quartertone in every instance of 7+3, so do not take that "q" literally.) Thus we have:
Graham Breed has a [http://x31eq.com/7plus3.htm page on his website] dedicated to 7+3 scales. He proposes calling the large step "t" for "tone", lowercase because the large step is a narrow neutral tone, and the small step "q" for "quartertone", because the small step is often close to a quartertone. (Note that the small step is not a quartertone in every instance of 7+3, so do not take that "q" literally.) Thus we have:
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