For each piece of music a composer, defines——— or the list of instruments to be used.
Range
TIMBRE
OCTAVES
Instrumentation
Range refers to the span of pitches within a piece of music, from the lowest note to the highest note. Composers will specify the range to ensure that the music is suitable for the instruments or voices that will be performing it.
Timbre refers to the quality of sound produced by an instrument or voice. Each instrument has its own unique timbre, which is determined by factors such as the shape, size, and materials of the instrument, as well as the way it is played. Composers will specify the timbre they desire for each instrument, which influences the overall sound and mood of the music.
Octaves refer to a series of eight notes within a specific pitch range. Composers may specify which octaves they want certain instruments or voices to play in, as this can affect the overall sound and texture of the music.
Instrumentation refers to the selection and combination of instruments or voices used in a musical composition. Composers will specify the instrumentation to indicate which instruments are necessary to perform the music and how they should be arranged or combined. This can vary greatly depending on the desired sound and concept of the composition.