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Electra-pianos Beginning in 1970 , RMI began producing the 300 Series Electra-piano , the sound of which became very familiar to fans of bands such as Genesis ( who used the instrument extensively from 1974 to 1977 ) , Yes and Deep Purple .
 RMI, Genesis
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 RMI, Genesis