Several composers have written works to which they gave the title “Concerto for Orchestra”. It is an unusual title because a concerto is normally a work for one solo instrument and an orchestra. The soloist is given a lot of opportunity to show off his (or her) talent. In a “Concerto for Orchestra” there is no soloist, but the composer thinks it is different from a symphony because a lot of the instruments in the orchestra are treated like soloists during the piece. This is what happens in Béla Bartók’s concerto.