When someone desired to know why Spartans do battle amidst the sound of fifes, he said, ‘So that, as all keep step to the music, the cowardly and the brave may be plainly seen.’ 1
1 Cf. Thucydides, v. 70; Xenophon, Constitution of Sparta, 13. 8; Lucian, On Dancing, 10; Cicero, Tusculan Disputations, ii. 16 (37); Valerius Maximus, ii. 6. 2.