第一次世界大战结束了,战胜国美国迅速强大起来,跃居世界前列,每年数以亿计的专利申请,相当欧洲三个大国的总和。在战争期间,美国的音乐活动,虽暂时被打乱正常秩序,但战后迅速复原,并很快就成为一个音乐繁荣的国度。而作为大战战场的欧洲,在饱经战祸之后,政治和经济不稳定,首先面临的是恢复四年战争所造成 After the First World War was over, the victorious United States rapidly gained strength and jumped to the top of the world with hundreds of millions of patent applications each year, equivalent to the sum of the three major European powers. During the war, the musical activities of the United States, although temporarily disrupted the normal order, quickly recovered after the war and soon became a nation of musical prosperity. As a battlefield battlefield Europe, political and economic instability in the aftermath of the scourge of war are the first to be caused by the resumption of the four-year war