Song Divine was published in 1941. The editor of the book states why Cantor Leibele Waldman was chosen by the publisher to write his autobiography:
One of the youngest cantors, born and raised on the East Side, with a remarkably matured voice shaded with delicate nuances, Cantor Waldman remains the symbol of the success of Jewish ideals coupled with a new outlook in a modern world.
Thank you Usher Piller for providing the website link!