她所有的歌都是凭记忆演奏的。

She plays all the songs ___by ___ear.

这段旋律是凭记忆美妙地演奏出来的。

The melody was beautifully ___played ___by ___ear.

许多爵士音乐家可以凭记忆演奏复杂的曲调。

Many jazz musicians can ___play complex tunes ___by ___ear.