A handwritten page of the chorus for Joseph Haydn's Scenda propizio un raggio (1764) will auction in a sale of music manuscripts at Sotheby's.
The lot carries an estimate of £150,000-200,000 ($228,150-304,200) ahead of the December 7 auction in London.
Sotheby's comments: "This is the most important autograph music manuscript by Haydn to appear at auction in the last two decades.
"It is a complete movement by Haydn; manuscripts in his hand of this length are among the rarest by any of the great masters of the classical era."
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