Take any song you want and play it by using the recorded bassoon notes in the media folder, shifting them up and down in frequency to create the right notes.

Question

What will be an ideal response?

Answer 1

Note: The best way to answer this challenge is to make use of the shift function from earlier in the chapter, but to rewrite it to translate to the required frequency. Additionally, one cannot simply call “play” as they will play all at once. A proof of concept is below:

```
def hotCrossBuns():
c4 = makeSound("bassoon-c4.wav")
cFreq = 261.63
dFreq = 293.67
eFreq = 329.63

quarterNote = getLength(c4)/4

eQuarter = shift2(c4, cFreq, eFreq, quarterNote)
dQuarter = shift2(c4, cFreq, dFreq, quarterNote)

target = makeEmptySoundBySeconds(10)
targetIndex = 0

#Measure 1
for index in range(0, quarterNote):
sourceValue = getSampleValueAt(eQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

for index in range(0, quarterNote):
sourceValue = getSampleValueAt(dQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1
for index in range(0, quarterNote*2):
sourceValue = getSampleValueAt(c4,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

#Measure 2
for index in range(0, quarterNote):
sourceValue = getSampleValueAt(eQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

for index in range(0, quarterNote):
sourceValue = getSampleValueAt(dQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

for index in range(0, quarterNote*2):
sourceValue = getSampleValueAt(c4,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

#Measure 3
for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(dQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1
for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(dQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1
for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(dQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1
for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(dQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(eQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1
for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(eQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1
for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(eQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1
for index in range(0, quarterNote/2):
sourceValue = getSampleValueAt(eQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

#Measure 4
for index in range(0, quarterNote):
sourceValue = getSampleValueAt(eQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

for index in range(0, quarterNote):
sourceValue = getSampleValueAt(dQuarter,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

for index in range(0, quarterNote*2):
sourceValue = getSampleValueAt(c4,int(index))
setSampleValueAt(target , targetIndex , sourceValue)
targetIndex+=1

play(target)
return target
def shift2(source, startFrequency, goalFrequency, length):
target = makeEmptySound(length)
sourceIndex = 0
factor = (goalFrequency/startFrequency)

for targetIndex in range(0, getLength(target)):
sourceValue = getSampleValueAt(source,int(sourceIndex))
setSampleValueAt(target , targetIndex , sourceValue)
sourceIndex = sourceIndex + factor
if (sourceIndex >= getLength(source)):
sourceIndex = sourceIndex - getLength(source)

return target
```