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.
The Planets The work is scored for a large orchestra consisting of four flutes (third doubling first piccolo and fourth doubling second piccolo and "bass flute in G", actually an alto flute),[24] three oboes (third doubling bass oboe), one English horn, three clarinets in B♭ and A, one bass clarinet in B♭, three bassoons, one contrabassoon; six horns in F, four trumpets in C, two trombones, one bass trombone, one tenor tuba in B♭ (actually a euphonium scored for treble clef), one bass tuba; a percussion section with six timpani (requiring two players), bass drum, snare drum, cymbals, triangle, tam-tam, tambourine, glockenspiel, xylophone, tubular bells; celesta, pipe organ; 2 harps and strings. In Neptune, two three-part women's choruses (each comprising two sopranos and one alto) located in an adjoining room which is to be screened from the audience are added.