กุญแจ, หีบเพลง, เปียโน, เพลง, ขนาด, กุญแจเปียโน, ออร์แกนปาก, โทน, เครื่องดนตรี, ตราสาร, ชั้นเรียนดนตรี
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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