| 100% | SONATA | 6 | Grieg wrote only one for piano |
| 51% | SONATA | 6 | One of three written for the piano by Chopin |
| 46% | SONATA | 6 | Liszt wrote only one |
| 42% | NORWEGIAN | 9 | Grieg, for one |
| 42% | ANNA | 4 | ___ Sewell, famous author who wrote only one novel, "Black Beauty" |
| 41% | ADHOC | 5 | For one purpose only |
| 41% | ACE | 3 | There's only one spot for this |
| 40% | EMILY | 5 | ___ Bronte, famous novelist and poet who wrote only one novel, "Wuthering Heights" |
| 40% | PASTERNAK | 9 | Boris ___, famous poet and author who wrote only one novel, "Doctor Zhivago" |
| 40% | DAMPER | 6 | Piano's soft pedal, for one |
| 40% | NORWEGIAN | 9 | Edvard Grieg, for one |
| 40% | SYLVIA | 6 | ___ Plath, famous poet and author who wrote only one novel, "The Bell Jar" |
| 39% | STATE | 5 | Washington is the only one named for a president |
| 39% | REUSABLE | 8 | Not for one time only |
| 39% | SALINGER | 8 | J.D. ___, famous author who wrote only one novel, "The Catcher in the Rye" |
| 38% | INSTRUMENT | 10 | Piano, guitar, or drums, for one, e.g. |
| 38% | LEG | 3 | One of three supports for a grand piano |
| 38% | MOTTO | 5 | "You only live once," for one |
| 38% | LABAMBA | 7 | Only one of Rolling Stone's "500 Greatest Songs" not written in English |
| 38% | LEFTHAND | 8 | Ravel wrote a piano concerto for it |
| 38% | CHOPIN | 6 | Frédéric who mostly wrote for solo piano |
| 37% | ORATORIO | 8 | McCartney wrote one for Liverpool |
| 37% | ALDA | 4 | Only person to win Emmys for acting, writing and directing |
| 37% | SONATAS | 7 | Beethoven wrote 32 of them for the piano |
| 36% | UNACORDA | 8 | Play piano with soft pedal, only hit one string |
| 36% | ESSAY | 5 | One of 51 written by Alexander Hamilton for the Federalist Papers |
| 36% | CINDERELL | 9 | Rodgers and Hammerstein's only musical written for TV |
| 36% | CONCERTI | 8 | Liszt wrote three for piano |
| 35% | BORIS | 5 | ___ Pasternak, Russian author who only wrote one novel, "Doctor Zhivago" |
| 35% | PYRAMID | 7 | The only remaining wonder of the ancient world, for one |