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The album was reviewed by Australian Guitar Magazine as " sheer guitar wizardry " Before he turned 21 Brett had toured with Tommy Emmanuel , Keith Urban , Harper , Carter & Carter , Mike Carr , Diana Corchran and Brendon Walmsley .
 Brett, Tommy Emmanuel, Keith Urban
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Brett, Tommy Emmanuel, Keith Urban