Bedienungsanleitung Alesis SR-16 (Seite 65 von 71) (Englisch)

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8.4 UNDERSTANDING RHYTHMIC NOTATION

Measures A piece of music is divided into smaller units called measures (also called bars),

and each measure is divided into beats. In the SR-16, each beat is further sub-divided into 96

sub-beats.

Rhythmic Values for Notes With a measure written in a 4/4 time signature, there are 4

beats per measure, and each beat represents a quarter (1/4) note. Thus, there are 4 quarter

notes per measure of 4/4 music. With a 3/4 time signature the "numerator" indicates that there

are 3 beats per measure, while the "denominator" indicates that each of these beats is a

quarter note (1/4).

There are two eighth notes per quarter note. Thus, there are eight eighth notes per measure

of 4/4 music.

There are four16th notes per quarter note. Thus, there are sixteen 16th notes per measure of

4/4 music.

There are eight 32nd notes per quarter note. Thus, there are thirty-two 32nd notes per

measure of 4/4 music.

There are also notes that span a greater number of beats than quarter notes. A half note

equals two quarter notes. Therefore, there are two half notes per measure of 4/4 music. A

whole note equals four quarter notes, so there is one whole note per measure of 4/4 music.

(We keep referring these notes to 4/4 music because that is the most commonly used time

signature in contemporary Western music.)

Triplets The above notes divide measures by factors of two. However, there are some

cases where you want to divide a beat into thirds, giving three notes per beat. Dividing a

quarter note by three results in eighth-note triplets. The reason why we use the term eighth-

note triplets is because the eighth note is closest to the actual rhythmic value. Dividing an

eighth note by three results in 16th-note triplets. Dividing a 16th note by three results in 32nd

note triplets.

Rests You can also specify where notes should not be played; this is indicated by a rest,

which can be the same length as any of the rhythmic values used for notes.

Dotted Notes and Rests Adding a dot next to a note or rest means that it should play

one-and-one-half times as long as the indicated value. This of course does not apply to

percussion parts. Example: A dotted eighth note would last as long as three 16th notes (since

an eighth note is the same as two 16th notes).

Uncommon Time Signatures 4/4 (and to a lesser extent 3/4) are the most common time

signatures in our culture, but they are by no means the only ones. In jazz, both 5/4 (where

each measure consists of five quarter notes) and 7/4 (where each measure consists of seven

quarter notes) are often used. In practice, complex time signatures are played like a

combination of simpler time signatures; for example, some 7/4 compositions would have you

count each measure not as 1, 2, 3, 4, 5, 6, 7 but as 1, 2, 3, 4, 1, 2, 3. It's often easier to think of

7/4 as one bar of 4/4 followed by one bar of 3/4 (or the other way around, depending on the

phrasing), since as we mentioned, 4/4 and 3/4 are extremely common time signatures.

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