"singing a song at the conclusion of a meeting makes sense only if this can be done well. The meeting chairman should give directions. It is to be sung standing up, not by singing one stanza as people are leaving. Thin and scattered voices by several party members make a bad impression, particularly when the opponent begins to sing his battle song."

Goebbels, Modern Political Propaganda (1930)
from German Political Propaganda Archive

http://www.calvin.edu/academic/cas/gpa/

(via whileatsea)