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It is most famous for the RMI Electra Piano , a keyboard instrument that created piano and harpsichord - like sounds without the use of strings , tines , or reeds , instead using transistors , much like the combo organs of the day .
 RMI Electra Piano
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 Electra Piano