the first movement has a slow introduction. the tune heard on the violins is already nearly like the "idée fixe". the "idée fixe" is heard in its full form when the music goes into the fast section. it is played by the violins and solo flute. the rhythm that the lower string instruments play underneath is very agitated. the form of the movement is not much like the traditional sonata form. berlioz was more interested in the "idée fixe" which keeps haunting the young artist all the way through.