Viết 1 khuôn ngạc gồm 5 ô nhịp mỗi ô nhịp gồm 2 phách các nốt do re mi fa sol la sí đố
2 câu trả lời
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Đô
_______________________________________si
La
_______________________________________son
Pha
_______________________________________mi
Rê
Đồ