音阶

例句：

1. 1. The composer composed a piece of music for the piano.
   作曲家为钢琴创作了一首曲子。
2. 2. The violinist played a beautiful melody on the concert stage.
   小提琴手在音乐会上演奏了一段美妙的旋律。
3. 3. The singer sang a song that perfectly matched the rhythm of the dance.
   歌手唱了一首歌，完美地与舞蹈的节奏相匹配。