A previously unknown piece of music composed by Wolfgang Amadeus Mozart when he was probably in his early teens has been uncovered at a library in Germany, researchers said Thursday.

A previously unknown Wolfgang Amadeus Mozart string composition for trio was recently discovered in a German library.

Leipzig Municipal Libraries have uncovered a previously unheard composition for a string trio written by a young Mozart.

A previously unknown piece of music likely composed by a teenage Wolfgang Amadeus Mozart was recently uncovered at a library in Germany. The piece, which dates to the mid- to late-1760s, consists of seven miniature movements for a string trio. It lasts around 12 minutes, researchers with the Leipzig Municipal Libraries said in a statement.

The 12-minute piece by Austrian composer, Wolfgang Amadeus Mozart, is called "Ganz kleine Nachtmusik" and was likely written when he was a teenager sometime in the mid-to late-1760s. Leipzig Municipal Libraries revealed the good news in a statement and that the piece will have its debut on Saturday at the Leipzig Opera.

The string trio, probably written in the composer’s teens, was found in a library as archivists compiled an updated catalog of his work

Turns out there’s at least one piece of music by Mozart that has not been studied and performed to death. As The Guardian reports, a previously unknown composition by Mozart has been discovered in a German library.