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It is known as congenital amusia, or an inability to hear music and understand it as — well — music.

It is unclear how many people suffer from amusia, in part because so often people who hear them simply assume they are bad singers.

Yet when a person has congenital amusia, it means that their biological wiring malfunctions and they are unable to "hear" music in the harmonious, enjoyable fashion experienced by everyone else.

For one thing, a person can have congenital amusia for a wide range of reasons.

If nothing else, Grant's life offers a glimpse at how someone with congenital amusia can try to make the best of their situation.