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" Un-Thinkable ( I 'm Ready ) " is a song performed by American recording artist Alicia Keys and has backing vocals provided by Canadian singer , Drake from her 2009 album , The Element of Freedom .
 Alicia Keys, Drake
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alicia Keys, Drake