major key signatures
major scale
其它 巧记五线谱 写美篇 高音谱表五线 egbdf, 四间 face 低音谱表
middle c is seen on the first ledger line above the bass staff.
▼低音谱号(bass clef)高音谱号(treble clef)先看几张视频截图准备一
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