1987
Through the mid-1990 s he contributed music to various demo and music groups , and music disks such as " Epidemic " ( 1994 ) , featuring other noted tracker musicians like Purple Motion and Skaven .
 organization: Purple Motion; organization: Skaven
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:
 organization: Purple Motion; organization: Skaven