Key Measures Key Measures refers directly to the music - melodies, rhythms, harmonies - selected to accompany and thereby "modulate" the images of television programs and other audiovisual productions for various screen media equipments. By their ephemeral nature as sound waves, Key Measures are invisible. In a broader metaphorical sense, they are also non-audible - that is, they are taken as symbols of a pseudo-universal culture and seem to be part of the moving images themselves.  © ECUS 2011