As Jazz moved into the 1930s large bands became the norm. Due to the success of such jazz orchestras, big band jazz became more and more popular until jazz became the popular music of the era. Swing was king and radio helped to spread the music across the country and the world. Singapore, India and even Moscow caught the jazz germ. This style of jazz would remain popular until after WWII when the economics of touring with a large band began to have an effect.