Sidney Joseph Bechet was born on May 14, 1897, in the Seventh Ward of New Orleans into a middle-class Creole family. Music filled the Bechet home — his father was an amateur flutist, his brothers were all musicians, and his elder brother Leonard was an accomplished trombonist and bandleader. Sidney largely taught himself, mastering the clarinet by eavesdropping on his brother's instrument and astonishing adult professionals with his gift before he reached his teens. He studied with some of the city's finest teachers, including Lorenzo Tio Jr. and Louis "Big Eye" Nelson, though his autodidactic instincts and refusal to be contained by formal training defined him from the start.
By his early teenage years Bechet was performing with legendary New Orleans bands: the Eagle Band with Bunk Johnson, the Young Olympians, and groups led by King Oliver and Clarence Williams. In 1914 he began traveling with touring shows and carnivals throughout the South. By 1917 he was in Chicago, and by 1919 he had reached New York and joined Will Marion Cook's Southern Syncopated Orchestra for a landmark European tour. It was on this tour that Swiss conductor Ernest Ansermet heard him and wrote an ecstatic review — among the first times a classical musician of standing had praised a jazz player in print — calling him an "extraordinary clarinet virtuoso" with improvisations of "richness of invention" and "daring novelty."