Read it through once

Having made up my mind to a refrain, the division of the poem into stanzas was, of course, a corollary, the refrain forming the close of each stanza. That such a close, to have force, must be sonorous and susceptible of protracted emphasis, admitted no doubt; and these considerations inevitably led me to the long “o” as the most sonorous vowel, in connection with “r” as the most producible consonant.