From Wikipedia:
“Chopsticks” (original name “The Celebrated Chop Waltz”) is a simple, widely known waltz for the piano. Written in 1877, it is the only published piece by the British composer Euphemia Allen (under the pseudonym Arthur de Lulli). Allen—whose brother, Mozart Allan, was a music publisher—was sixteen when she composed the piece, with arrangements for solo and duet. The title “Chop Waltz” comes from Allen’s specification that the melody be played in two-part harmony with both hands held in a vertical orientation, little fingers down and palms facing each other, striking the keys with a chopping motion. The similar “The Coteletten Polka” also was first heard in 1877, with the piano collection Paraphrases elaborating on the theme by 1879. “Chopsticks” continues to be popular in various forms of media. […]
On January 3, 1969, the second day of the “Get Back” sessions, Paul McCartney noodled on the piano and played “Chopsticks“, waiting for John Lennon and George Harrison to arrive in the studio.
Songs written or co-written by Euphemia Allen
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Unreleased song
