其曲子

例句：

1. 1. The melody of the song is so beautiful that it can make you forget about your troubles.
   这首歌的旋律如此美妙，以至于它能让你忘记你的烦恼。
2. 2. She hummed the tune to herself while walking in the park.
   她在公园里散步时哼唱着那首歌。
3. 3. The composer composed a piece of music for the performance.
   作曲家为演出创作了一首曲子。