When Nicholas McCarthy was 15, he telephoned a local music school to ask about taking piano lessons and mentioned that he was disabled, having been born without a right hand.

The school principal didn’t take the news well. “How will you even play scales?” McCarthy recalled her saying, dismissively, before hanging up.

Now, some 20 years later, McCarthy is set to prove anyone who doubted him wrong — and in a high-profile way. On Sunday at the Royal Albert Hall in London, McCarthy is the star name for a concert at the Proms, Britain’s most prominent classical music series.

In front of thousands of spectators in the hall, as well a live TV audience, McCarthy, 36, will perform Maurice Ravel’s bravura Piano Concerto for the Left Hand, using the grand piano’s sustain peddle to elongate the bass notes while his hand leaps around the keyboard.

“Ravel’s really created an aural illusion,” McCarthy said. “Everyone might be thinking, ‘Bloody hell, I’m only seeing five fingers playing, but I’m hearing so many hands.’”