很多曲子除了主旋律延长之外，还有就是bass 低音需要延长，这样也可以让一个曲子保持一直连贯，不会断断续续。下面这个练习就是bass 音延长的练习。
这个标记的就是有错误的谱子，BASS 音没有标记延续，我们看正确的标记方法。
这样表示的就是bass 低音的延长，这样保持低音延长的话，我们弹奏的练习就会感觉很流畅不会断断续续。
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