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简单学电子琴系列（9）：《世上只有妈妈好》附伴奏操作标注和弦
电子琴《世上只有妈妈好》附自动伴奏操作步骤，左右手指法
简单学电子琴系列（中老年简谱版）9/15
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App02:40电子琴《世上只有妈妈好》附自动伴奏操作步骤，左右手指法
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