Final answer:
The second section of Alla hornpipe might differ from the first in tonality, atmosphere, or instrumentation. Woodwind instruments change pitch with air column length, while stringed instruments use string vibrations. Option A is correct.
Step-by-step explanation:
The second section of Alla hornpipe differs from the first in several ways. One potential difference could be in the tonality, where the key signature might change, creating a different mood or atmosphere.
Another difference could be that it becomes more reflective in character, possibly through dynamics, tempo, or a change in instrumentation such that a smaller subset of the orchestra, like only strings and woodwinds, carries the section. However, the specific difference between the first and second sections of this piece could vary based on the interpretation of the music.
Discussing how musical instruments create sound, it is notable that the pitch produced by an instrument is related to the length of the resonating air column or vibrating string. Instruments like woodwinds often change pitch by opening and closing finger holes or valves, and thus changing the length of the air column.
Conversely, stringed instruments produce sound by vibrating strings, where the pitch is modified by changing the length, tension, or mass per unit length of the string. Both types of instruments are capable of playing across a wide range of frequencies, from very low to very high.