68. The inverted mordent
(note the absence of the vertical line) is like the mordent except that the tone below is replaced by the tone above in each case. This ornament is sometimes called a "transient shake" because it is really only a part of the more elaborate grace called "trill." (See Fig. 44.)
The confusion at present attending the interpretation of the last two embellishments described, might be largely obviated if the suggestion of a recent writer[11] to call the one the upward mordent, and the other the downward mordent were to be universally adopted.
69. The turn consists of four tones; first, the diatonic scale-tone above the principal tone; second, the principal tone itself; third, the tone below the principal tone; and fourth, the principal tone again.
When the sign (
or