...The song varies greatly in different districts; thus, inBahia Blanca it is without the long trill at the end, and in otherlocalities I have found it vary in other ways... 
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...The call is a trill of a single noterapidly reiterated, and loud enough to be heard half a mile away; thecry being accompanied by vibratory motions of the wings...
P. L. Sclater 「Argentine Ornithology, Volume I (of 2)」
...Beforeeven the robin was awake, earlier than dawn, he would start themorning chorus with the simple little trill that answers for a song toexpress every emotion throughout the long day...
Neltje Blanchan 「Birds Every Child Should Know」
...Call, a recognizablechip; song, a short, simple trill...
Frank M. Chapman 「Color Key to North American Birds」
...Call, a characteristictchip; song, a trill...
Frank M. Chapman 「Color Key to North American Birds」
...Call,chip; song, a musical whistle, cher-weé, cher-weé-cher-weé,cheé-o, dee-e-e-e-e; with many variations but usually endingin a trill...
Frank M. Chapman 「Color Key to North American Birds」
...This species loves to sit on a telegraph wireor at the very summit of a tree and pour forth its song, which consistsof a pleasant, if somewhat harsh, trill or warble of a dozen or morenotes...
Douglas Dewar 「Birds of the Indian Hills」
...Its proper songis full, loud, clear, and powerful, rapidly executed and terminatingin a trill or shake, followed by two or three unimportant notes...
Rev. C. A. Johns 「British Birds in their Haunts」
...Then he took up the real music lessons, and taught him how to whistleand how to warble and trill...
Gene Stratton-Porter 「The Song of the Cardinal」
...Saunders (1951:257-258) describes this song as short, and buzzlike, beginning with two or three short, rather faint notes and ending in a trill at first loud but fading away toward the end...
Glen E. Woolfenden 「Comparative Breeding Behavior of Ammospiza caudacuta and A. maritima」
...There was the trill of a canary withthe sun on its cage...
Various 「Astounding Stories of Super-Science February 1930」
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