organ builders began to lean towards specifications with fewer mixtures and high-pitched stops. they preferred to use more 8′ and 16′ stops in their specifications and wider pipe scales. these practices created a warmer, richer sound than was common in the 18th century. organs began to be built in concert halls (such as the organ at the palais du trocadéro in paris), and composers such as camille saint-saëns and gustav mahler used the organ in their orchestral works.