Page "Arrangement" Paragraph 18
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George Martin, producer and arranger for The Beatles, warns arrangers about the intonation issues when only two like instruments play in unison.
" After a string quartet ," Martin explains, " I do not think there is a satisfactory sound for strings until one has at least three players on each line ... as a rule two stringed instruments together create a slight " beat " which does not give a smooth sound.
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