乐章

例句：

1. 1. The composer composed several pieces of music for the concert.
   作曲家为音乐会创作了几首曲子。
2. 2. This book has three chapters, each with a different theme.
   这本书有三个章节，每个都有不同的主题。
3. 3.The artist performed several songs during the show, each with a unique style.
   艺术家在演出中表演了几首歌，每首歌都有独特的风格。