atonalist
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a·ton·a·list
(ā-tō′nə-lĭst)n.
One who composes atonal music.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
atonalist
(eɪˈtəʊnəlɪst)n
a composer who composes without knowingly or being aware of alluding to a particular tone or scale
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014