Fétis protested against Liszt's insinuation. But Thalberg had at his concert in the Paris Conservatoire on 12 March 1837, played for the first time his "Mosè" fantasy. The audience noted a magical effect. They could see that in the finale Thalberg was playing a bass and accompanying with his left hand. His right hand was busily occupied with rapid arpeggios. But in addition, a broad melody was to be heard. Liszt's explanation of the thumb-melodies was accurate. This characterization of his style followed him until the end of his life.