The 1940s (pronounced "nineteen-forties" and commonly abbreviated as "the 40s" or "the Forties") was a decade that began on January 1, 1940, and ended on December 31, 1949. Most of World War II took place in the first half of the decade, which had a profound effect on most countries and people in Europe , Asia , and elsewhere.
In the early 1940s, bebop emerged, led by Charlie Parker, Dizzy Gillespie, Thelonious Monk and others. It helped to shift jazz from danceable popular music towards a more complex "musician's music." Differing greatly from swing, early bebop divorced itself from dance music, establishing itself more as an art form but lessening its potential popular and commercial value.
Se denomina años 1940 o años cuarenta del siglo XX al decenio que empezó el 1 de enero de 1940 y terminó el 31 de diciembre de 1949.. La Segunda Guerra Mundial marcó como ningún otro acontecimiento la década de 1940 y el siglo en general.