The Latin word accentus means of emphasis. With him we meet, as a rule, when it comes to language. "Foreigners can learn the accent. "In the Russian language, unlike many others, the emphasis is very capricious, changeable, falling on the first and the last, and one of the middle syllables". In these two sentences the word "accent" is used in different senses.
In music it is the same, which can be seen in the second example above. The emphasis is stronger, percussion removing any one of the sound compared to the others. Usually accented sound is at the beginning of the measure, on its first part. For example, waltz (try humming to himself any waltz melody), in his three-brained the amount of stress necessary every time on the first of the three lobes of tact. And in March accented. the shock of the shares will be the first of two or four.
But there are times when the focus was shifted. For example, in the Mazurka he, as a rule, is on the third (or second) part. Occurs whimsical, changeable rhythm characteristic of this dance. This shifting of emphasis from strong share beat on low is called syncopal and is an effective means of expression. Composers often use it.
When accented sound is at the beginning stage, the emphasis is of course by itself and does not specifically indicated. If he moved to another portion of tact or should be especially strong, its indicate in the notes icons or abbreviations sforzando, sforzato (emphasis, force, highlighting) - sf.