Final answer:
The concept described is known as resonance, where sound waves build up by constructive interference until they are loud enough to hear. Resonance occurs not only in musical instruments but also in other scenarios such as blowing over a bottle or the sound produced by a violin's sounding box. Examples of resonance are found in various aspects of music.
Step-by-step explanation:
The concept described in the question, where sound waves build up by constructive interference until they are loud enough to hear, is known as resonance.
Resonance occurs not only in musical instruments, but also in other scenarios where sound waves interfere constructively, such as blowing over a bottle or the sound produced by a violin's sounding box. In resonance, only the resonant frequencies interfere constructively to form standing waves, while other frequencies interfere destructively and are absent.
Examples of resonance and standing waves can be found in many aspects of music, where changing frequencies of various instruments and voices create an interesting and pleasant sound.