If the mean of a dataset is 25 and its standard deviation is 1.6, then. 1  68% of the values in the dataset will lie between MEAN-1SD (25-1.6=23.4) and MEAN+1SD (25+1.6=26.6) 2  99% of the values will lie between MEAN-3SD (25-4.8=20.2) and MEAN+3SD (25+4.8=29.8).
For the first time, during the Classical period most of the important stylistic advances that occurred can be observed most clearly in the instrumental forms: the symphony, concerto, sonata, and in instrumental chamber music (e.g., the Beethoven string quartets).
The classical period is often referred to as the golden age of music, because many of the major composition forms were developed during this period. Many compositions included multiple sections that were different in tempo and style, as opposed to the smooth transitions in Baroque music.Article from Wikipedia.oodwind instruments became more refined in the Classical period. Mozart expanded the role of the clarinet in orchestral music. Most instruments used during this period were invented in previous time periods. The string quartet became a standard ensemble.