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Rh It is necessary then to view these Organ Concertos in the proper sense of magnificent concerts for a huge public. Great shadows, great lights, strong and joyous contrasts, all are conceived in view of a colossal effect. The orchestra usually consists of two oboes, two violins, viola, and basses (violon-cellos, bassoons, and cembalo), occasionally two flutes, some contrabassos and a harp. The concertos are in three or four movements, which are generally connected in pairs. Usually they open with a pomposo, or a staccato, in the style of the French overture, often an allegro in the same style follows. For the conclusion, an allegro moderato, or an andante, somewhat animated, sometimes some dances. The adagio in the middle is often missing, and is left to be improvised on the organ. The form has a certain relation with that of the sonata in three movements, allegro-adagio-allegro, preceded by an introduction. The first pieces of these two first concertos published in Volume XLVIII of the