一個規律、有週期性的聲音稱為樂音，反之則稱為噪音。愈有週期性的聲音會愈好聽，許多音樂甚至還會加入某些音效來強調音樂的週期性，明確地點出節奏，來豐富音樂的內容。用來強調節拍的樂器常是打擊樂器，有許多種類，鼓在這裡佔了非常重要的地位哦！
在Csound中，要合成打擊樂器的聲音比較困難，因此這個部份通常會使用外部的聲音檔案來解決。鼓是打擊樂器的代表，在這裡就以鼓組的的聲音來搭出節奏吧！
鼓組的音效可以按這裡下載。
節奏程式範例
<CsoundSynthesizer>
<CsOptions>
</CsOptions>
<CsInstruments>
sr = 44100 ;sample rate
ksmps = 16 ;samples in a control period
nchnls = 1 ;number of channels
0dbfs = 100 ;value of 0db
instr 20
ininstr = 100 ;number of loop cycles
index = 0 ;loop counter
istart = 0
iradio = 60./p4
ib_half_half = 0.25 * iradio;
ib_half = 0.5 * iradio;
ib_one = 1 * iradio;
ib_one_half = 1.5 * iradio;
ib_two = 2.0 * iradio;
ib_two_half = 2.5 * iradio;
ib_three = 3.0 * iradio;
ib_three_half = 3.5 * iradio;
ib_four = 4.0 * iradio;
loop:
;------Put your instruments here------
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 17
istart = istart + ib_one
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 17
istart = istart + ib_one
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 17
istart = istart + ib_one
;-------------------------------------
loop_lt index, 1, ininstr, loop
endin
instr 10
;Settings
iTable init p5 ;Funcation table number
iTableLen tableng iTable ;Funcation table length
iFreq init sr / iTableLen * (cpspch(p4)/cpspch(8.0)) ;Cycle per second
aenv linseg 1, 1./iFreq, 1, 0, 0, p3-1./iFreq, 0
asig oscil 100, iFreq, iTable
out aenv*asig
endin
</CsInstruments>
<CsScore>
f11 0 32768 1 1 0 0 2
f12 0 32768 1 2 0 0 2
f13 0 32768 1 3 0 0 2
f14 0 32768 1 4 0 0 2
f15 0 32768 1 5 0 0 2
f16 0 32768 1 6 0 0 2
f17 0 32768 1 7 0 0 2
t 0 120
;ins strt dur pitch table
;i10 0 1 8.00 17
;ins strt dur tempo
i20 0 100 120
e
</CsScore>
</CsoundSynthesizer>
只要更改第20號樂器loop內的樂器搭配方式，就可以打出不同的節奏啦！
節奏分享
兩拍節奏
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart, ib_one, 8.00, 17
istart = istart + ib_one
event_i "i", 10, istart, ib_one, 8.00, 13
istart = istart + ib_one
三拍節奏
istart2 = istart
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 13
istart = istart + ib_one
四拍節奏
istart2 = istart
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 13
istart2 = istart2 + ib_half
event_i "i", 10, istart2, ib_half, 8.00, 14
istart2 = istart2 + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 13
istart = istart + ib_one_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_one_half
八拍節奏
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 17
istart = istart + ib_one
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 17
istart = istart + ib_one
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 13
istart = istart + ib_half
event_i "i", 10, istart, ib_half, 8.00, 17
istart = istart + ib_half
event_i "i", 10, istart, ib_one, 8.00, 17
istart = istart + ib_one