'RHYTHM' is defined as 'a strong regular repeated pattern of movement or sound' or 'the systematic arrangement of musical sounds, principally according to duration and periodical stress'.
Definitions taken from the Oxford English Dictionary at https://www.lexico.com/en/definition/rhythm (5th August 2019)
Hemiola
Tempo
Diminution
Triplets
Metre
Groupings
Dotted Rhythms
Augmentation
Tied Notes
Note Lengths
Anacrusis
Rubato
Cross Rhythms
Syncopation
To remember these terms and what to look for when analysing music and RHYTHM, we remember:
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Metre
Note Lengths
Hemiola
Groupings
Anacrusis
Tempo
Dotted Rhythms
Rubato
Diminution
Augmentation
Cross Rhythms
Tuplets
Tied Notes
Syncopation
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Metre
Metre refers to the grouping of rhythm into beats into a measured length we call a bar.
These are represented by two numbers on top of each other, the lower number refers to the type of beat while the top refers to how many of those beats are in the bar. For example Simple Quadruple (4/4) has 4 crochet beats in a bar were as Compound Double (6/8) has 6 quaver beats in a bar.
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Note Lengths
Describing if you have short fast rhythms or long held notes.
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Hemiola
When you impose a metre feel into a different metre that is written.
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Groupings
Phrases grouped into equal rhythmic values e.g. of 2 or 3 or 4
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Anacrusis
Often known as a pickup bar, this is when we have 1 or 2 notes that proceed the opening down beat of a bar. An Anacrusis only applies to the beginning of a piece of music.
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Tempo
The speed at which the music is played, either fast or slow. In the musical era's we give certain tempos names:
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Dotted Rhythms
A dotted rhythm is were halve of the note length value is added onto the note.
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Rubarto
Also known as freedom of tempo or robbed time, a relaxed approach to tempo were you can apply an expressive appropriate quickening or slowing down of speed.
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Diminution
Taking a rhythmic phrase that is repeated but the note length values are halved making the phrase twice as short.
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Augmentation
This is the same as diminution but in the opposite direction were note values are doubled making the phrase twice as long.
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Cross Rhythms
One rhythm against another were the subdivisions don't line up in the piece of music. This can range from a single to several bars.
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Tuplets
A grouping of 3 equally spaced notes in the space of 2 equally spaced notes. Other tuplets exist when you are fitting an odd irregular number of notes into and even number of notes e.g 5 notes into 4.
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Tied Notes
Notes that are tied over a bar line.
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Syncopation
Rhythms that are off-beat, accenting weaker upbeats rather than strong downbeats.