Pairs of cymbals are used to add a particular timbre to the overall sound of the orchestra, to provide accents and accentuate climaxes.
The instrument's sound is very conspicuous and should therefore be used with care.
Pair of cymbals + other percussion instruments
A good blend of percussion instruments is achieved especially by those with a bright and penetrating sound such as the triangle, tambourine, bells, sleigh bells and castanets.
The combination with the bass drum and other lower percussion instruments (timpani, tom-tom etc.) produces a different, very particular and effective composite timbre.
Pair of cymbals + brass instruments
Trumpets and trombones combine especially well with the cymbal and the timbre becomes more penetrating.