Starting in 1927, recording technology advanced from mechanical to electrical, thereby increasing quality and efficiency. With falling prices for gramophones also becoming a factor, record companies formed in rapid succession.
1927 年起，唱片錄音技術從機械式進步為電氣錄音（指演出者或樂團錄音時，使用插電的麥克風），品質與效率提高，加上留聲機價格降低，於是唱片公司紛紛成立。