What is the music for an orchestra called?

The music written specifically for an orchestra to perform is called orchestral music. It involves a large ensemble of musicians playing various string instruments (violins, violas, cellos, and double basses), woodwind instruments (flutes, clarinets, oboes, bassoons, etc.), brass instruments (trumpets, trombones, French horns, tubas, etc.), and percussion instruments. Orchestral music can include instrumental pieces such as symphonies, concertos, overtures, and suites, as well as other musical compositions that feature the orchestra as the main performing ensemble.