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Pianist Florian Birsack plays a rediscovered work by Mozart on a piano forte at the International Mozarteum Foundation in Salzburg, Austria, on Friday. (Kerstin Joensson / Associated Press)

A long-lost piano piece experts attribute to Mozart has been performed on his piano at his Salzburg home.

The Mozarteum Salzburg Foundation staged Friday's event. It says the manuscript was found last summer as part of a 160-page book of handwritten piano music in the attic of a house in Tyrol.

The book was dated 1780 — 24 years after Mozart was born — and the manuscript played Friday bears the name "Del Signore Giovane Wolfgango Mozart." That's Italian for "Mr. Wolfgang Mozart Jr."

Musicologist Hildegard Hermann-Schneider says the fact that other pieces in the book were known works by Mozart's father, Leopold, strengthened the case that the work was genuine. Leopold Mozart also often used "Wolfgango" when labeling works written by his young son.

From the style of the composition, Hermann-Schneider attributed it to Mozart at around the age of 11.

The piece exhibits "a series of components that are found repeatedly in other Mozart piano works," said the Mozarteum in a

statement. "Judging by the current level of knowledge, it thus has to be a genuine sonata phrase from Mozart."