character: Mr. Harmon
topic: Understanding Frequency and Amplitude
grade: 9
subject: Music
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character: Professor Soundwave
topic: Sound Waves: The Basics of Sound Propagation
grade: 9
subject: Music
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character: Ms. Melody
topic: The Role of Frequency in Music
grade: 9
subject: Music
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character: Dr. Acoustics
topic: Amplitude and Perception of Sound
grade: 9
subject: Music
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