The most expensive musical instrument in the world: This rare viola is now valued at $30 million

Roberto Díaz performed at the Library of Congress with the $30 million Tuscan-Medici viola, crafted by Stradivari in 1690. The instrument, now permanently gifted to the library, is renowned for its sound quality and rarity, with only around 10 Stradivari violas known to exist.

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