The violinist is a magician on stage, his performance is simply breathtaking.

magician 是名词，来自 magic（魔术）加上后缀 -ian（表示"从事...的人"），指"魔术师、有魔法的人"。这里用作比喻，形容小提琴手技艺高超如同施展魔法般神奇。