Hollandaise sauce mayonnaise and Béarnaise, the egg does not coagulate as in a custard; rather, the lecithin in the eggs serves as an emulsifier, allowing the mixture of the normally immiscible butter and lemon juice to form a stable emulsion. To make hollandaise sauce, beaten egg yolks are combined with butter, lemon juice, salt, and water, and heated gently while being mixed. Some cooks use a double boiler in order to control the temperature. Some recipes add melted butter to warmed yolks; others call for unmelted butter and the yolks to be heated together; still others combine warm butter and eggs in
French classical music the twentieth-century, composers took many different paths. Some composers looked backwards to the light, elegant Classical works, with the Neoclassicism of the Russian-French composer Stravinsky. Austro-German composers such as Schoenberg and Berg and used a tortured, dramatic style called Expressionism. The French composer Boulez abandoned the entire tonal (key-centered) tradition of Western music with a style called Serialism. Other composers explored electronic music (Stockhausen); chance-based or random (aleatoric) music and indeterminacy (Cage); and minimalism (Reich, Glass). French classical music French classical music began with the sacred music of the Roman Catholic Church, with written records predating the reign of Charlemagne.