The Three Main Categories of Drugs. Some drugs due to certain factors that change their characteristics, may cause them to fall under different categories at different times. For example, even though Cannabis is considered a depressant, in high enough doses it can also be a hallucinogen. The three main categories were constructed based on similarities that certain drugs share; however, there are many differences that these drugs have also.
A rhythm is very identifiable, even if the composer changes all the notes and the harmonies. Because of this, Beethoven use the rhythm of the Fate motif loads of times all throughout the 5th symphony, to tie it together. The Fifth symphony, like all symphonies at the time, is in four movements... 1  1st Movement, Sonata. 2  The powerful first movement opens with the Fate motif, which runs through it in one way or another throughout.
Grove reports that with respect to the immediate forerunner of the modern symphony, one generally refers to the opera sinfonia that, in the 18th century, consisted of three parts: fast--slow--fast (eventually also in dance rhythm).