The science of voice : an application of the laws of acoustics, anatomy, physiology and psychology to the problems of vocal technic, including sections on music and interpretation, acoustics, advice to those interested in the radio and talking movies, and descriptions of original researches / by Douglas Stanley ... With a section on interpretation and musicianship by Alma Stanley... and a section on physical principles by Stanley Watkins ... and three appendices outlining the developments of the last decade.