As metrical and the thematic, rhythm in composition, harmonic, collective composition a melody, each component is harmonious decided this raises music to be denied then euphonic and pleasant.

• 如同乐曲中的主旋律、节奏、和声、韵律共同组成一首曲子，各组成部分是否和谐、融洽决定了这支曲于是否悦耳动听。