The following pages are intended to form a record of my experience in a department of music which has hitherto been left to professional routine and amateur criticism. I shall appeal to professional executants, both instrumentalists and vocalists, rather than to conductors; since the executants only can tell whether, or not, they have been led by a competent conductor. I do not mean to set up a system, but simply to state certain facts, and record a number of practical observations.