Which of the following orchestras was the earliest one?

Among those four orchestras, Mantovani Orchestra is the earliest one, founded in 1935 by Annunzio Mantovani(1905-1980), an Italian British conductor, composer and light orchestra-styled entertainer with a cascading strings musical signature.

Mantovani Orchestra marks the birth of light music, featuring very clear and charming melody and wonderful performance style, making the light music quickly establish the position between classical and popular music. It highlights high grade of musical performance, philosophical flowing melody and beautiful string music. It uses pop music methods to adapt classical songs, making people gradually familiar with the masterpieces of Beethoven, Chopin, Tchaikovsky and other masters.

1960s and 1970s are the light music heyday. Along with Mantovani Orchestra, James Last Orchestra by German composer and big band leader James Last (1929 – 2015) in 1964, and Le Grand Orchestre de Paul Mauriat by French composer, orchestra leader and music arranger Paul Mauriat(1925-2006) in 1965 become famous light music bands in the decades of performance and recording practice. In the late 1970s and early 1980s, they almost attracted all the attention of fans.

The Johann Strauss Orchestra is a pops orchestra founded in Netherlands in 1987 by André Rieu (b. 1949), a Dutch violinist and conductor. The orchestra is well known for performing classical works with a distinctly unorthodox frivolity, joking with the audience and performing all sorts of antics.