The hurdy gurdy became the basis for bal-musette music, which arrived in Paris by 1880 as a result of Auvergnat migration. The influence of Antoine Bouscatel led to bal-musette incorporating the Italian accordion, which soon came to dominate the music. This is the period that produced internationally known masters like Léon Chanal, Emile Vacher and Martin Cayla. Vacher's light style, rhythmic nature and distinctive tremolo defined the genre for many audiences in France and beyond. During World War I, elements of American jazz became a part of bal-musette. The style also became the basis for a genre called valse musette.