Thomson, Virgil Garnett 1896-1989. American composer and music critic. His works include the opera Four Saints in Three Acts (1934), with a libretto by Gertrude Stein.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.