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Thus Fig. 3, b, if the first measure of a composition, should have an F clef immediately preceding the G clef in the left-hand part.

If the requirements of the music are such that pitches above F, the fifth line G clef, must be occasionally sung, let the voices upon the part sing lightly.

The G clef, also, when first introduced, was often written upon the third or the first line; the F clef, moreover, was not definitely established on the fourth line until toward 1700.

Example: The G clef makes the second line represent the pitch G. Avoid "fixes G on."

The note C of the G clef is made by two hundred and fifty-seven vibrations of air per second.