Questions & explanations
1. What is a simple chordophone and how is it different from a guitar?
A simple chordophone is a string instrument where the string bearer and resonator are either separate or not clearly separate. For example, a zither has strings stretched over a flat board, and the board is both the string bearer and resonator. A lute has a neck and body, but in simple chordophones, the neck is not separate? Actually, simple chordophones include zithers, lutes, and harps, but in Hornbostel-Sachs, simple chordophones are those without a neck? Let me clarify: In Hornbostel-Sachs, simple chordophones (class 31) are instruments where the string bearer and resonator are either separate (like a harp) or not separate (like a zither). A guitar has a neck and body, so it is a composite chordophone (class 32). So a simple chordophone like a zither has no neck; the strings run the whole length of the body.
2. What is the difference between a lute and a zither in terms of construction?
A lute has a body with a neck, and the strings run from the neck to the body. The body is a resonator. In a zither, there is no neck; the strings are stretched over a flat board or box, and the board itself is the resonator. So the main difference is that a lute has a distinct neck, while a zither does not. However, in Hornbostel-Sachs, both are simple chordophones if the neck is not separate? Actually, lutes are simple chordophones only if they have no neck? Wait, lutes are usually composite. Let me correct: In Hornbostel-Sachs, simple chordophones include zithers (no neck), harps (no neck), and lutes? Actually, lutes are composite chordophones because they have a neck. So a lute is not simple; it is composite. So the difference is that a zither has no neck, while a lute has a neck.
3. If you cover the end of a recorder completely, what happens to the boundary condition and the pitch?
Covering the end of a recorder changes the boundary from open to closed. The tube becomes closed at both ends (mouthpiece is also closed by the fipple). In a closed-closed tube, the fundamental frequency is half the wavelength of the tube length, which is the same as an open-open tube of the same length, but the harmonics differ. However, covering the end lowers the pitch because the effective length increases? Actually, covering the end makes the tube closed at that end, so the air column extends to the closed end, but the boundary condition change may affect the pitch. In practice, covering the end of a recorder lowers the pitch by about a semitone because the effective length increases slightly, but the main effect is that the note becomes more muffled and less stable.
4. In Hornbostel-Sachs, singing membranophones are class 242. What does the 24 mean?
In Hornbostel-Sachs, class 24 is plucked membranophones, but singing membranophones are actually class 242? Wait, let's check: Actually, singing membranophones are class 242? No, standard classification: 24 is plucked membranophones (like the Indian mridangam? No, that is struck). Actually, singing membranophones are class 242? I think they are class 242? Let me correct: According to Hornbostel-Sachs, membranophones are 2, and the second digit indicates playing action: 21 struck, 22 plucked, 23 friction, 24 singing (mirlitons). So class 24 means the membrane is made to vibrate by voice. So 24 is singing membranophones. The third digit can specify shape, but 24 is the main group.
5. Compare how a trill is performed in Baroque music versus Romantic music on the piano.
In Baroque music, a trill usually starts on the upper auxiliary note and is played evenly, often ending with a turn (the note below). It is more rhythmic and often fits within the beat. In Romantic music, trills often start on the main note and can be played with varying speed, sometimes accelerating. They are used more for expressive effect and can be longer and more flexible. Baroque trills are more formulaic and serve to decorate the melody, while Romantic trills add drama and emotion. The instrument also matters: Baroque trills were designed for harpsichord's plucked sound, while Romantic trills exploit the piano's sustaining pedal and dynamic range.
6. How does FM synthesis create different timbres?
FM synthesis, short for frequency modulation synthesis, creates timbres by using one waveform (the modulator) to change the pitch of another waveform (the carrier). When the modulator oscillates quickly, it adds sidebands—new frequencies—around the carrier's frequency. By choosing different ratios between modulator and carrier frequencies, you get different harmonic or inharmonic sounds. For example, a simple ratio like 1:1 gives a bright tone, while a non-integer ratio creates bell-like or clangorous sounds. FM synthesis is efficient and can produce realistic brass, bell, and electric piano sounds. It was popularized by the Yamaha DX7 synthesizer.
7. How does wavetable synthesis differ from subtractive synthesis?
Wavetable synthesis uses a table of stored single-cycle waveforms, each with a different harmonic content. The synthesizer can scan through these waveforms over time, creating a changing timbre. In contrast, subtractive synthesis starts with a fixed waveform and filters it. Wavetable synthesis can produce complex, evolving sounds by morphing between waveforms, while subtractive is better for static or slowly changing sounds. Wavetable also allows for digital manipulation like crossfading and interpolation. Both methods are common in digital synthesizers, but wavetable is more flexible for creating new and unusual timbres.
8. Give an example of a sound best made with additive synthesis and explain why.
Additive synthesis builds sounds by adding together sine waves at different frequencies and volumes. It is great for creating realistic organ sounds because an organ pipe produces a fundamental tone plus several harmonics that can be precisely controlled. For example, a flute-like sound uses only a few low harmonics, while a reed stop uses many harmonics. Additive synthesis can also make evolving sounds by changing the volume of each harmonic over time. However, it requires many oscillators, so it was historically difficult but is now possible with digital technology. It offers complete control over the sound's spectrum.
9. Explain physical modeling synthesis and give an example of an instrument it can simulate.
Physical modeling synthesis simulates the physical properties of an instrument, like strings, tubes, or membranes, using mathematical equations. It models how vibrations travel through the material, how they are reflected, and how sound radiates. For example, it can simulate a piano by modeling the hammer hitting a string, the string's vibration, and the soundboard's resonance. The player can change parameters like string tension, hammer hardness, or damping to get different sounds. This method is very realistic and expressive, but requires powerful computers. It is used in some digital pianos and software synthesizers.
10. Why might a performer choose a slower tempo for a Baroque dance movement than a modern pianist would?
In historical performance, tempos are often chosen based on the dance character and the instrument's capabilities. Baroque dances like the allemande or courante had specific step patterns that suggest a moderate tempo. Also, harpsichords and fortepianos have less sustain than modern pianos, so fast tempos can make the notes blur together. A slower tempo allows the ornaments and inner voices to be heard clearly. Modern pianists sometimes play faster to show off technique, but historically informed performers prioritize dance feel and clarity. The tempo should let the music breathe and the listener follow the rhythm.
11. Explain how the boundary condition at the reed of a clarinet affects the sound wave. Give an example.
The reed at the mouthpiece acts as a nearly closed boundary because it blocks most airflow, but it vibrates. When the reed is closed, the pressure inside the mouthpiece is high; when it opens, pressure drops. This creates a pressure wave that travels down the tube. The boundary condition at the reed is that the air velocity is nearly zero when the reed is closed. This makes the clarinet behave like a closed-end tube. For example, when playing a low E, the reed closes and opens once per cycle, producing a sound wave with a node (zero air movement) at the reed and an antinode (maximum air movement) at the open end.
12. How does articulation differ between playing Bach on a modern piano versus a harpsichord?
On a harpsichord, the strings are plucked, so the sound decays quickly and you cannot change volume by touch. Therefore, articulation—how you connect or separate notes—is very important to create phrasing and emphasis. Players often use shorter, more detached notes to mimic the harpsichord's crisp sound. On a modern piano, you can use dynamics (loud/soft) to shape phrases, so articulation is less critical. In historical practice, when playing Bach on a piano, you might imitate harpsichord articulation by playing non-legato (not fully connected) to keep the clarity. This helps the music sound more authentic.