Based on polygon convex hull method, the chord line is extracted.
采用了基于多边形凸包的方法提取弦线。
He used the higher notes of a chord as a melody line and made other changes.
他运用更高音调的和弦音作为旋律线并做了其它的修改。
"He began working on the song" Cherokee. "he used the higher notes of a chord as a melody line and made other changes." He now could play the things he had been hearing.
他开始创作“切罗基”，他使用弦乐中较高音符作为乐曲主弦律并做了些别的变化，现在他可以演奏听到过的曲子。
Chord: a line segment that joins two points on a curve.
弦：将两点用曲线连接起来的曲线段。
Listen to the effect: you put some tension to the last three beats of the line, and that tension is not resolved before you change to the IV chord in the second line.
听一听效果：你加了一些压力到这一段的最后三拍上，这种压力只有你在换到第二段的属七和弦时才得到解决。
Listen to the effect: you put some tension to the last three beats of the line, and that tension is not resolved before you change to the IV chord in the second line.
听一听效果：你加了一些压力到这一段的最后三拍上，这种压力只有你在换到第二段的属七和弦时才得到解决。
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