A caller portion of euphony believed to beryllium by the Polish composer Frederic Chopin has been discovered astir 200 years aft it was archetypal written.
The chartless waltz was unearthed successful the vault of the Morgan Library and Museum successful New York.
The uncommon manuscript - dated betwixt 1830 and 1835 - was discovered by curator Robinson McClellan portion helium was cataloguing caller collections.
He past worked with a starring Chopin adept to authenticate the score.
It is not signed by Chopin, but the handwriting includes his distinctive bass clef.
The waltz has insignificant errors successful bushed and notation but Mr McClellan said helium is definite that Chopin is down it.
"What we're astir definite astir is it is written successful the manus of Chopin, insubstantial that helium wrote connected himself successful his ain hand," helium told BBC's Newshour.
"What's not wholly definite is that it's euphony that helium composed.
"I consciousness astir 98% sure, and galore radical who person heard it already consciousness successful their gut this sounds similar Chopin."
He continued: "There are atypical aspects of the music, the benignant of stormy opening is simply a small astonishing but not wholly retired of character.
"And past the melody truly to maine is wherever you consciousness that Chopin quality."
Superstar pianist Lang Lang has recorded the waltz for the New York Times, which broke the story.
Chopin, who wrote mostly soft solos, died aged 39 successful France successful 1849.
He was hounded by hallucinations during his comparatively abbreviated beingness and astir apt had epilepsy, Spanish researchers believe.