He's considered one of the greatest composers of all time - yet his death remains shrouded in mystery.
It's not clear which illness caused the death of Wolfgang Amadeus Mozart on the 5th of December 1791.
But a new book from writer and opera singer Lynn John raises a new theory about whether Mozart actually faked his own death and lived on for many years.
Not only did he live in secret, but that he went on to influence and work with another great composer: Gioachino Rossini.
Lynn is originally from Wales and was a member and soloist with the Morriston Orpheus Choir - one of the best known in the UK - and was also with New Zealand Opera for 21 years.
That was when he met Italian conductor Eliano Mattiozzi - who set him on the path of research for his book A Secret Never to Be Told.
You can find more detail about the book and where to buy it here, or pick up a copy at Paper Plus Orewa.