The following lectures were delivered to music students between the years 1907 and 1915. They have been partly rewritten so as to be intelligible to a different audience, for in all cases the lectures were followed by a discussion in which various points not dealt with in the lectures were elucidated. An experience of eight years in organizing a training course for students who wish to teach ear-training on modern lines to classes of average children in the ordinary curriculum of a school has shown me that the great need for such students is to realize the problems, not only of musical education, but of general education