After the orchestral rehearsals began in late March, Monteux drew the composer's attention to several passages which were causing problems: inaudible horns, a flute solo drowned out by brass and strings, and multiple problems with the balance among instruments in the brass section during fortissimo episodes.
Despois de que a finais de marzo comezasen os ensaios da orquestra, Monteux chamou a atención do compositor en varias pasaxes que causaran problemas: trompas inaudibles, un solo de frauta afogado polos metais e as cordas, e numerosos problemas co balance entre os instrumentos da sección de metais durante as pasaxes en fortissimo.