56841
Following the abrupt departure from the Byrds of singer and guitarist Gram Parsons in July 1968 , White was invited to join the group as a full-time member , remaining until the band was finally dissolved by lead guitarist Roger McGuinn in February 1973 .
 the Byrds, Gram Parsons, White, Roger McGuinn
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 the Byrds, Gram Parsons, White, Roger McGuinn