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Versuch einer gründlichen Violinschule ( English : A Treatise on the Fundamental Principles of Violin Playing ) is a textbook for instruction in the violin , published by Leopold Mozart in 1756 .
 person: Leopold Mozart
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Leopold Mozart