[A]t the time when he [Berlioz] scored Weber's 'Invitation a la Yalse' for the orchestra, he made me play it to him, and when I had come to the point where, after the digression into C major, the theme is resumed in the original key, D flat, he interrupted me with the words, 'Apres tout, cela va,' confessing that from the perusal of the piece he had thought the modulation too harsh, and almost impossible.