It's star pianist Lang Lang's party piece, and at London's Steinway Hall we were armed with the appropriate piece of fruit.
Got a piano? Got a fruit bowl? You can now master one of the most difficult pieces in the Romantic piano repertoire.
In this video, the superstar Chinese pianist demonstrates how to effortlessly play Chopin's virtuosic 'Black Key Étude' Op. 10, No. 5 - all with the help of a delicious, round, citrusy friend.
What's next, Lang Lang? Thalberg's Grande Fantasie on the Barber of SEVILLE? (sorry)