Here's a short story:

The piano on which Mozart wrote all of his late works returned home to Vienna for the first time since his death in 1791.The piano will stand in his former Vienna home, now a museum, for two weeks, ending in a concert of the works by Mozart. Mozart bought the instrument from Anton Walter, the most famous piano maker of his time, in 1782.He wrote more than 50 works for the piano on it, many of them in the apartment in Vienna.After Mozart's death, Constanze, Mozart's wife, gave the instrument to their elder surviving son, Carl Thomas, who donated it to the Mozarteum Salzburg on what would have been the composer's 100th birthday.The piano is now part of the permanent exhibition in the Austrian city of Salzburg. " It was very hard to let it go," said Matthias Schulz, director of the Mozarteum Salzburg." If we didn' t know it was in the best hands, we wouldn' t have done it." The piano is much smaller and lighter than modern concert ones.Its sound is fresher and brighter than that of a modern piano, with lighter action and hammers . Piano restorer Josef Meingast, who has looked after the Mozart piano since 1975, said it was superior to any of its surviving copies.Meingast said he had to fight to replace the existing strings , dating from a 1973 restoration, with softer ones that produce a rounder sound thought to be more similar to what Mozart would have produced. Russian pianist Alexander Melnikov, who planned to give a concert of Mozart' s music on the piano on November 7, said he was privileged to play such an instrument.It's easily the biggest day of a musician' s life." (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: what instrument was Melnikov going to play on Nov 7?
Guess: Mozart's piano
Confidence: <appropriate level of confidence in this guess>

Question: who looked after the piano since 1975?
Guess: Josef Meingast,
Confidence: <appropriate level of confidence in this guess>

Question: what year had replacement strings been put in?
Guess: 1973
Confidence: <appropriate level of confidence in this guess>

Question: when did Mozart die?
Guess: 1791
Confidence: <appropriate level of confidence in this guess>

Question: where is his piano now?
Guess: Salzburg
Confidence: <appropriate level of confidence in this guess>

Question: when did he buy the piano?
Guess: 1782
Confidence: <appropriate level of confidence in this guess>

Question: what museum has it?
Guess: Mozarteum Salzburg
Confidence: <appropriate level of confidence in this guess>

Question: is that his former home?
Guess: no
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: who donated the piano originally?

his son