乐谱准确地标明了该演奏哪些音符以及每个音符的时长。

The sheet music indicates exactly which ___notes to play and for how long.

仿佛有一股外力在阻止他弹出那些音符。

It was as if an external force was stopping him from playing the ___notes.

一个和弦由同时演奏的几个音符组成。

A chord is composed of several ___notes played simultaneously.