Two long-lost organ pieces written by a teenage Johann Sebastian Bach were unveiled in Germany on Monday in a discovery described as a "great moment for the world of music".

The two solo organ works, written while Bach was working as an organ teacher in the town of Arnstadt in Thuringia early in his career, first caught the attention of researchers over 30 years ago.

But it is only now that experts have been able to prove they were written by Bach after finally confirming the identity of the person who penned the manuscripts.

The Chaconne in D minor BWV 1178 and Chaconne in G minor BWV 1179 have been added to the official catalogue of Bach's works as of Monday.

They were also performed for the first time in 320 years at the St Thomas Church in Leipzig, where Bach is buried and served a

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