7443
These roots included musical elements introduced by Andy Irvine who , having returned to Ireland from The Balkans , introduced Eastern European music and time signatures to the group Planxty who then proceeded to record a number of these instrumental tracks .
 person: Andy Irvine
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: Andy Irvine