เสียง, คลื่นเสียง, ความถี่, เพลง, คลื่นความถี่, เบา, ปริมาณ, รูปแบบของคลื่น, ดนตรี
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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