a section; an excerpt
If you are referring to the 3 separate parts of a sonata or concerto, we call them "movements".
1st movement; 2nd movement; 3rd movement
"A piece of music" refers to the entire piece, not just a part of it.
2011年6月29日
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通常用a piece of music来表示“一段音乐”。
不过a piece of music也有“一首乐曲”的意思,留意一下。