主乐调

例句：

1. 1. The composer's main theme is the gentle melody of a flute.
   作曲家的主要主题是一支长笛的温柔旋律。
2. 2. The music festival featured performances by various artists, each with their own main melodies.
   音乐节上各种艺术家的表演都有各自独特的主旋律。
3. 3. In classical music, the main melodies are often used to convey emotions and tell stories.
   在古典音乐中，主旋律通常用来传达情感和讲述故事。