Accidental signs is a sign which can change the pitch in one measure. These markers are no longer valid in bar next. To better understand this accidental marks should track above the first song sung with the right intonation.
At the time signatures into three, four, and six are signs that serve to lower mole half tones. In bars third and four, tone marked mol b after being bes. While the tone of a six-bar to turn into aces.
Each tone to be awarded with the name mole plus ice, but the tone's a plus. Similarly, the sharp sign, sign moles also only applies to one measure. In terms of international standards, the tone marked mol / flat name plus a flat, eg b to b flat.