II. THE VARIOUS KINDS OF MUSIC
There are many different kinds of music, requiring certain differences in psychophysical equipment for their execution, severally. For instance, singing requires certain equipment which may be lacking in a highly gifted organist. An organist must have characteristics which are possibly dispensable to the harpist.
To sing, to play the piano, to play the violin, to play the trombone, to compose a symphony, to write musical criticism—these are by no means all necessarily possible to the same person. A complete inventory of musical talent will rest upon knowledge of how all the various kinds of music are related as regards the capacities required in each, and of how the violinist may differ from the singer, and the drummer from the conductor of an orchestra.