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Rh first can readily be enlarged so as to suit particular cases. Starting with the Major scale, the notes "one above" or "one below" are easy to recognize. It is not advisable at this stage to point out the different qualities of a "Second," as long as the interval is correctly named.

The next easy interval to recognize and sing is the octave. This has already been seen in Exercise 11. An octave always occupies, one line and one space with three lines between:  etc.

Sing the common chord by ear;  explain that the notes sung between the octave are the Third and Fifth. Show how, if the notes start on a line, the Third and Fifth will also be on a line:

Now, sing C, think D, and sing E:  Sing C, think D and E and sing F. The major Sixth and Seventh are always hard to sing. To reach a Sixth, strike the Fifth, already learned in the common chord, and go up one, then think the Fifth and sing the Sixth. When the Third, Fifth and Octave of the common chord are sung readily, the singing a Fourth becomes merely a matter—for the time being—of thinking the Third and adding a semitone; similarly with a Sixth—thinking the Fifth,—and with the Seventh, thinking the