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The " Sea organ " ( ) is an architectural sound art object located in Zadar , Croatia and an experimental musical instrument , which plays music by way of sea waves and tubes located underneath a set of large marble steps .
 location: Zadar; location: Croatia
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:
 location: Zadar; location: Croatia