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He was also featured in a number of songs on the EP. Grohl played rhythm guitar for the song " If You Have Ghosts " ( a cover of a Roky Erickson song ) , and drums on " I 'm a Marionette " ( an ABBA cover ) as well as " Waiting for the Night " ( a Depeche Mode cover ) .
 Grohl, Roky Erickson, ABBA, Depeche Mode
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Grohl, Roky Erickson, ABBA, Depeche Mode