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The JGB was a solo act in the sense that Garcia dominated it , but its musicians , organist Melvin Seals , bass player John Kahn , and drummer David Kemper , had been with him regularly for years , as had backup singers Gloria Jones and Jackie LaBranch .
 Melvin Seals, John Kahn, David Kemper
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Melvin Seals, John Kahn, David Kemper