Jazz originated in the early 1900s and became popular in the 1920s, known as the Jazz Age. It developed from African musical traditions brought by slaves to the US and was performed in dance halls and nightclubs. Common jazz instruments of the era included the saxophone, which produced lively beats and rhythms. Famous jazz composers like Louis Armstrong, Ella Fitzgerald, John Coltrane, and Betty Carter helped popularize the new musical style, though some viewed jazz as inappropriate.