Two newly discovered piano pieces by Wolfgang Amadeus Mozart have been performed in the Austrian city of Salzburg, where the composer was born in 1756.

The International Mozarteum Foundation that owns the pieces had long judged them anonymous. Experts now are virtually certain they were composed by Mozart when he was seven or eight years old. Both pieces were performed by Austrian musician Florian Birsak on Mozart's own piano at a house in Salzburg where he lived as a young man and which is now a museum.

They were performed in front of the media only. The general public will be able to hear them live in January during Salzburg's annual Mozart Week. When Mozart died in 1791 aged 35, he had composed in every major genre, in all more than 620 pieces, including symphonies, operas, solo concertos, chamber music and piano sonatas.