Sergei Rachmaninov's Piano Concerto No. 3 — "Rach 3," as fans fondly call it — is one of the most famously difficult pieces of music there is. The sheet music goes on and on, with notes so dense the ...

For a pianist, difficulty comes in many flavors, from the most obvious — tossing off fistfuls of notes with fiendish precision and dexterity — to more delicate tasks like making a persuasive case for ...