character: Echo the Explorer
topic: Properties of Sound Waves
grade: 9
subject: Music
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character: Echo the Explorer
topic: Sound Wave Frequencies
grade: 9
subject: Music
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character: Echo the Explorer
topic: Reflection and Refraction of Sound
grade: 9
subject: Music
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character: Echo the Explorer
topic: Applications of Sound Waves in Music
grade: 9
subject: Music
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