Meaning of Tempus Imperfectum Diminutum in Music
In music, **tempus imperfectum diminutum** refers to a specific time signature or mensuration scheme. It is represented by a vertical line through the C-shaped time signature symbol (4/4), indicating a doubling of tempo or a faster version of the music. This time signature is also known as **alla breve** or **cut time**. The term "tempus imperfectum diminutum" comes from the notational practice of late-Medieval and Renaissance music, where it signified a doubling of the speed or proportio dupla in duple meter.
The use of tempus imperfectum diminutum can be seen in the notation of music from the 14th through the 16th centuries. It was often used to indicate a faster tempo or a change in the rhythmic interpretation of a passage. Sometimes, the same line of music had to be performed under different mensuration schemes, leading to slower (augmented) and faster (diminished) versions of the same passage. In such cases, the music was typically notated only once, and several different mensuration signs, including tempus imperfectum diminutum, were placed in front of it together.
It's worth noting that the term "tempus imperfectum diminutum" is not commonly used in modern music notation. Instead, the vertical line through the C-shaped time signature symbol (4/4) is generally understood to represent alla breve or cut time.
Overall, tempus imperfectum diminutum is a historical term used to describe a specific time signature or mensuration scheme in music notation, indicating a doubling of tempo or a faster version of the music.
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