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In 1966 , Reed Ghazala discovered and began to teach math " circuit bending " & mdash ; the application of the creative short circuit , a process of chance short-circuiting , creating experimental electronic instruments , exploring sonic elements mainly of timbre and with less regard to pitch or rhythm , and influenced by John Cage ’s aleatoric music concept .
 person: Reed Ghazala; person: John Cage
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Reed Ghazala, John Cage 
Answer:
 person: Reed Ghazala; person: John Cage