真正的工作是由那些知道如何演奏萨克斯管的人来完成的，或者是那些用几个和弦和一个摇摆节奏就即兴创作一段很长的旋律的人来完成的。
The real work was being done by people who knew how to play the saxophone or improvise a long melody with a few chords and a swing beat for support.
我们不确定我们能多完整地重现旋律或节奏，因为它们显然在很多情况下是即兴创作的。
We are not sure how well we can reproduce the melodies or rhythms, because they were apparently improvised in many cases.
他的祖父注意到他在玩玩具时常常即兴哼出旋律来。
His grandfather noticed that he would often improvise melodies as he played with his toys.
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