NEW YORK -- The hottest Broadway show is shining its spotlight on a collection of historic American documents: Alexander Hamilton's letters, being auctioned at Sotheby's.

Dozens of his letters will go on the block Jan. 18. Their estimated worth starts at $1.4 million and tops $2 million. But a Sotheby's manuscript expert says the feverish interest in the musical "Hamilton" is likely to drive prices up.

The designer of the show's sets, David Korins, also created parts of Sotheby's Americana exhibit that includes the kind of furniture and art that surrounded Hamilton in his daily life.

Javier Munoz, who plays him, got teary-eyed Tuesday as he held a letter from Hamilton's son to the man he calls "Papa."

Munoz says that reading Hamilton's private thoughts will have a deep effect on his performance.