Not being able to hum along with a Mozart sonata or a Metallica dirge may be annoying, but it pales in comparison to not being able to tell faces apart.

• 患有声调耳聋症的人，无法听辩乐符。然而，其带来的困扰不及面盲。不能喝着哼唱莫扎特奏鸣曲或哀扬的金属乐曲固然不幸，但相较于无法辨别面容，便鲜值一提。