A sharp sign marked "#" on the score line or the gap between the score lines is used to indicate that the pitch is half a degree higher than that without this mark. "?"on the line or between the lines of a five-line score. A symbol (similar to the letter B) used to indicate that its pitch is half a degree lower than that of lines or lines without this symbol.

In addition, the re-ascending "X" means raising the basic tone level by two semitones (a whole tone). Heavy drop mark "?" It means to lower the basic level by two semitones (a whole tone). Reduction mark (? ) means to restore the sound that has been raised or lowered.

A diacritical mark is a mark used to indicate raising or lowering the basic tone level. The diacritical mark written after clef is called key signature. Before the new key is changed, it will take effect on all sounds with the same name in the series.

Extended information:

Corresponding relationship between key signature and Diaoyu:

1. key signature and Diaoyu and their name comparison table key signature always use the same symbol, or all use the # sign or all use the ь sign. Key signature's writing, whether ascending or descending, has a certain order, but this order is not from low to high, nor from high to low, but according to the order of the five-degree chain.

2. key signature with the number "#" is in the order of #F, #C, #G, #D, #A, #E (that is, f) and #B (that is, c) from left to right; On the other hand, the key signature composed of "ь" is in the order from right to left: ьB, ьE, ьA, ьD, ьG, ьC (that is, b) and ьF (that is, e).

3. The number of elevator signs that make up the key signature is at most 7. Because of the use of the average law, the fifth degree chain is cyclical and can go on and on, and the six "#" signs are exactly the same as the six "ь" signs. All the tones of a scale are homonyms (they are equal on the keyboard but recorded in different positions on the staff), and this relationship is called homophony, and these two tones are equal to each other.

4. This tuning range is like the intersection section when the five-degree chain is closed into a ring. When crossing this range, the increase of the ascending sign can be replaced by the decrease of the descending sign. For example, seven "#" signs and five "ь" signs are equal tones; On the contrary, the increase in the number of flat signs can be replaced by the decrease in the number of flat signs, for example, seven "ь" signs and five "#" signs are equal tones.

Baidu Bai-phonetic symbols

Baidu Encyclopedia-key signature.