31019
In the 1980 s , electronic music became more dominant in popular music , with a greater reliance on synthesizers and the adoption of programmable drum machines such as the Roland TR-808 and bass synthesizers such as the TB-303 .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None