31638
During the appearance , they re-emphasised that they intended never to officially reunite , citing the opinion of Robert Plant that the re-formed Led Zeppelin was more like a cover band of itself than the original band .
 Robert Plant, Led Zeppelin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robert Plant, Led Zeppelin