Section “slur” in Music Glossary - LilyPond
Section “slur” in Music Glossary - LilyPond
Section “slur” in Music Glossary - LilyPond
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Chapter 1: <strong>Music</strong>al terms A-Z 48<br />
modern time signatures with and without reduction of note values. (These signs are hard-coded<br />
<strong>in</strong> <strong>LilyPond</strong> with reduction.)<br />
perfect tempus with major prolatio<br />
Indicated by a complete circle with an <strong>in</strong>ternal dot. In modern time signatures, this<br />
equals:<br />
• 9/4, with reduction or<br />
• 9/2, without reduction<br />
perfect tempus and m<strong>in</strong>or prolatio<br />
Indicated by a complete circle without an <strong>in</strong>ternal dot. In modern time signatures,<br />
this equals:<br />
• 3/2, with reduction or<br />
• 3/1, without reduction<br />
imperfect tempus and major prolatio<br />
Indicated by an <strong>in</strong>complete circle with an <strong>in</strong>ternal dot. In modern time signatures,<br />
this equals:<br />
• 6/4, with reduction or<br />
• 6/2, without reduction<br />
imperfect tempus and m<strong>in</strong>or prolatio<br />
Indicated by an <strong>in</strong>complete circle without an <strong>in</strong>ternal dot. In modern time signatures,<br />
this equals:<br />
• 4/4, with reduction or<br />
• 2/1, without reduction<br />
The last mensuration sign looks like common-time because it is, with note values reduced from<br />
the orig<strong>in</strong>al semibreve to a modern quarter note. Be<strong>in</strong>g doubly imperfect, this sign represented<br />
the (theoretically) least-preferred mensuration, but it was actually used fairly often.<br />
This system extended to the ratio of longer note values to each other:<br />
• maxima to longa, called:<br />
• modus maximorum,<br />
• modus major, or<br />
• maximodus)<br />
• longa to breve, called:<br />
• modus longarum,<br />
• modus m<strong>in</strong>or, or<br />
• modus<br />
In the absence of any other <strong>in</strong>dication, these modes were assumed to be b<strong>in</strong>ary. The mensuration<br />
signs only <strong>in</strong>dicated tempus and prolatio, so composers needed another way to <strong>in</strong>dicate<br />
these longer ratios (called modes. Around the middle of the 15th century started to use groups<br />
of rests at the beg<strong>in</strong>n<strong>in</strong>g of the staff, preced<strong>in</strong>g the mensuration sign.<br />
Two mensuration signs have survived to the present day: the C-shaped sign, which orig<strong>in</strong>ally<br />
designated tempus imperfectum and prolatio m<strong>in</strong>or now stands for common time; and the<br />
slashed C, which designated the same with dim<strong>in</strong>ution now stands for cut-time (essentially, it<br />
has not lost its orig<strong>in</strong>al mean<strong>in</strong>g).<br />
See also<br />
<strong>Section</strong> 1.85 [dim<strong>in</strong>ution], page 24, <strong>Section</strong> 1.239 [proportion], page 61, <strong>Section</strong> 1.308 [time<br />
signature], page 76.