Don’t worry, it all balances out - his family just min-maxed his character into music. Most of his stats were comically low. For example, Mozart was really bad at ordering food from a drive-through or even ordering a takeaway by phone or through an app.
Other things Mozart was shit at:
Using a mobile phone
Riding a bike
Driving a car
Microwaving his own dinner
Using a computer
Assembling flat-pack furniture
Mariokart
Wiring a plug
Installing Linux
Fastening velcro shoes
Using self-service at the supermarket
Using a toaster
Celebrating his 36th birthday
He couldn’t do a single one of those things. You can probably do at least two of them. So what if he beats you at music?