chord of varying sections

例句：

1. 1. The melody of the song is so beautiful.
   这首歌的旋律如此美妙。
2. 2. The harmony between the two instruments is perfect.
   两种乐器之间的和谐完美无瑕。
3. 3. The composer played a chord on the piano to set the mood.
   作曲家在钢琴上弹奏了一个和弦，为音乐定下了基调。