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American University Difference Between Flute Sound & Human Voice Reflection

I need support with this Music question so I can learn better.

Using the terms discussed in lectures and class, watch these two pairs of two videos and discuss some timbral or purely sonic differences between them. By this, I mean we should be talking about overtones, sympathetic vibrations, amplitude, attack/sustain/release, noise/sound, and so on—we’re all aware that a flute sounds different than a person’s voice and that an electric guitar sounds different than a wind ensemble, so let’s talk about how they’re different.

1 & 2, from Bachianas Brasileiras No. 5 by 20th-century Brazilian composer Heitor Villa Lobos:

https://www.youtube.com/watch?v=aYxQFf3gGVk (Links to an external site.)