قراءة كتاب Music Notation and Terminology
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orchestral instruments (cello, viola, etc.) of extended range, in order to avoid having to use too many leger lines; and (2) for indicating the tenor part in vocal music. This latter usage seems also to be disappearing however, and the tenor part is commonly written on the treble staff, it being understood that the tones are to be sung an octave lower than the notes would indicate.
The C clef as used in its various positions is shown in Figs. 7, 8, and 9. It will be noted that in each case the line on which the clef is placed represents "middle C."
18. A sharp is a character which causes the degree of the staff with which it is associated to represent a pitch one half-step higher than it otherwise would.
Thus in Fig. 10 (a) the fifth line and first space represent the pitch F, but in Fig. 10 (b) these same staff degrees represent an entirely different tone—F♯. The student should note that the sharp does not then raise anything; it merely causes a staff degree to represent a higher tone than it otherwise would. There is just as much difference between F and F♯ as between B and C, and yet one would never think of referring to C as "B raised"!
19. A flat is a character that causes the degree of the staff with which it is associated to represent a tone one half-step lower than it otherwise would. (See note under Sec. 18 and apply the same discussion here.)
20. A double-sharp causes the staff degree on which it is placed to represent a pitch one whole-step higher than it would without any sharp. Similarly, a double-flat causes the staff degree on which it is placed to represent a pitch one whole-step lower than it would without any flat.
Double-sharps and double-flats are generally used on staff degrees that have already been sharped or flatted, therefore their practical effect is to cause staff degrees to represent pitches respectively a half-step higher and a half-step lower than would be represented by those same degrees in their diatonic condition. Thus in Fig. 10 (b) the first space in its diatonic condition[7] represents F-sharp, and the double-sharp on this degree would cause it to represent a pitch one-half step higher than F-sharp, i.e., F-double-sharp.
CHAPTER III
Symbols of Music Defined (Continued)
21. The natural[8] (sometimes called cancel) annuls the effect of previous sharps, flats, double-sharps, and double-flats, within the measure in which it occurs. After a double-sharp or double-flat the combination of a natural with a sharp, or a natural with a flat is often found: in this case only one sharp or flat is annulled. (Sometimes also the single sharp or flat will be found by itself, cancelling the double-sharp or double-flat). The natural is often used when a composition changes key, as in Fig. 11, where a change from E to G is shown.
22. The group of sharps or flats (or absence of them) at the beginning of a staff partially indicates the key in which the composition is written. They are called collectively the key-signature.
23. The same key-signature may stand for either one of two keys, the major key, or its relative minor, hence in order to determine in what key a melody is one must note whether the tones are grouped about the major tonic DO or the minor tonic LA. In a harmonized composition it is almost always possible to determine the key by referring to the last bass note; if the final chord is clearly the DO chord the composition is in the major key, but if this final chord is clearly the LA chord then it is almost certain that the entire composition is in the minor key. Thus if a final chord appears as that in Fig. 12 the composition is clearly in G major, while if it appears as in Fig. 13, it is just as surely in E minor.
24. Sharps, flats, naturals, double-sharps and double-flats, occurring in the course of the composition (i.e., after the key signature) are called accidentals, whether they actually cause a staff degree to represent a different pitch as in Fig. 14 or simply make clear a notation about which there might otherwise be some doubt as in Fig. 15, measure two. The effect of such accidentals terminates at the bar.
25. In the case of a tie across a bar an accidental remains in force until the combined value of the tied notes expires. In Fig. 16 first measure, third beat, an accidental sharp makes the third space represent the pitch C sharp. By virtue of the tie across the bar the third space continues to represent C sharp thru the first beat of the second measure, but for the remainder of the measure the third space will represent C unless the sharp is repeated as in Fig. 17.
26. The following rules for making staff degrees represent pitches different from those of the diatonic scale will be found useful by the beginner in the study of music notation. These rules are quoted from "The Worcester Musical Manual," by Charles I. Rice.