the orchestra has how many primary instrument groups
Orchestra The typical symphony orchestra consists of four groups of related musical instruments called the woodwinds, brass, percussion, and strings (violin, viola, cello and double bass). Other instruments such as the piano and celesta may sometimes be grouped into a fifth section such as a keyboard section or may stand alone, as may the concert harp and electric and electronic instruments. The orchestra, depending on the size, contains almost all of the standard instruments in each group.
Conducting The principal conductor of an orchestra or opera company is sometimes referred to as a music director or chief conductor, or by the German words Kapellmeister or Dirigent. Conductors of choirs or choruses are sometimes referred to as choral director, chorus master, or choirmaster, particularly for choirs associated with an orchestra. Conductors of concert bands, military bands, marching bands and other bands may hold the title of band director, bandmaster, or drum major. Respected senior conductors are sometimes referred to by the Italian word, maestro ("master" as in "one who has mastered the art").