Teacher:In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Teacher: Now, understand the problem? Solve this instance: One of the rarest and priciest violins in the world was hidden away in a closet for decades, but it is now up for auction at Christie's, with bidding starting Friday. 
  
 "Our pre-sale estimate on this is $7.5 million to $10 million," said Kerry Keane, head musical instrument specialist at Christie's, who is hosting the sealed-bid auction. Bidding will go on until June 12. 
  
 Part of why this violin is so valuable is its provenance. The violin was made in 1731 by Antonio, who is considered to be the greatest violin maker ever. His 600 surviving violins are highly sought after by collectors, giving them multimillion-dollar price tags. 
  
 The violin up for auction is known as the Kreutzer Stradivari, named for its first-known owner, Rodolphe Kreutzer. 
  
 If you learned to play the violin, you can likely thank Kreutzer, a French violinist and teacher, who penned the 42 Études, a commonly used foundation for teaching students to play the instrument. 
  
 Eventually, the violin came to be owned by Huguette Clark, a wealthy reclusive heiress. She received this pricey Stradivari from her parents, who were American royalty during the Gilded Age. 
  
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 "There is a spectacular telegram that her parents sent her in Paris in 1920 that told her...when they were sailing and when they would be arriving in New York, and that her mother had just bought her, quote unquote, the most fabulous violin in the world," Keane said. 
  
 The violin is one of more than 400 items from the family collection that Christie's is auctioning. It was found in Clark's closet after collecting dust for decades, according to Keane. 
  
 This Stradivari is from his late period. "What's important about his later works is that they're the ones that are consistently the most powerful for players tonally. It has this warm gutsy sound that they produce, and with great color and complexity for the musician," Keane said. 
  
 To ensure that the violin is the real deal, Christie's analyzed the ring growths in its wood, a process known as dendrochronology. 
  
 "We did a dendrochronology of it. It matches four Stradivaris from 1730 to 1734 made from the same tree. That is a great find. It's like a fingerprint," Keane said. 
  
 -- Jennifer Schlesinger ||||| The 300-year-old Stradivarius violin that was taken from the Milwaukee Symphony Orchestra's concertmaster in an armed robbery is pictured in Milwaukee, Wisconsin in this February 6, 2014 handout photo at a news conference after it was recovered. 
  
 A detail is seen inside the Kreutzer Stradivarius violin in London May 9, 2014. . 
  
 Kerry Keane, Christie's Musical Instruments specialist, poses for a photograph with the Kreutzer Stradivarius violin in London May 9, 2014. 
  
 NEW YORK A Stradivarius violin forgotten in a closet for decades and formerly owned by a reclusive U.S. heiress to a copper fortune could sell for as much as $10 million in a sealed bid auction next month, according to Christie's. 
  
 If the 1731 violin, known as "The Kreutzer" after the French concert violinist Rodolphe Kreutzer who once owned it, reaches the top end of its pre-sale estimate it would be one of most expensive musical instruments ever sold. 
  
 The violin is one of the highlights of the sale from the estate of Huguette Clark, a reclusive, eccentric heiress who owned sprawling Manhattan apartments and palatial homes but chose to spend her final decades living in a New York hospital where she died in 2011 at the age of 104. 
  
 After she died, the violin was found in a closet, where it had been for 25 years. 
  
 The highest price paid for a Stradivarius violin is $16 million. A rare viola made by the Italian artisan Antonio Stradivari in 1719 that will be sold by Sotheby's in a sealed bid auction in June is valued at $45 million. 
  
 "Kreutzer owned and played his namesake Stradivari from about 1795 until his death in 1831," Christie's said in a statement. 
  
 The instrument was a present from her parents, copper magnate and politician William A. Clark and his wife Anna, to the then-teenaged Huguette. 
  
 The violin will be sold in a special auction with bidding starting on June 6 and will coincide with the New York sale of more than 350 lots from the Clark estate on June 18. 
  
 (Reporting by Patricia Reaney; Editing by Mary Milliken and Cynthia Osterman) |||||
Student:
Funny what turns up in the closet of reclusive, deceased heiress: In this case, one of the world's most expensive musical instruments. Christie's has begun accepting sealed bids for a 1731 Stradivarius violin that had been in a closet of Huguette Clark for about 25 years, reports NBC News. The auction house estimates its worth to be $7.5 million to $10 million, which would be below the Stradivarius record of $16 million but still not too shabby for a longtime dust-collector, notes Reuters. This particular Stradivarius is so pricey in part because it was first owned by renowned concert violinist Rodolphe Kreutzer, both stories explain. Clark's parents bought it in 1920, with her mom sending the teenaged Huguette a telegram from Paris to say she had just bought her "the most fabulous violin in the world," says a Christie's musical expert. Analysis of the wood's ring growths confirms that the violin is legit. (Click to read about how Stradivari may not match up to modern violins.)