Not long after RCA Victor was founded, it fell into trouble due to the Great Depression. However, because RCA's radio sales were promising, it was able to support the development of the recording plan. During this period, RCA Victor recorded wonderful performances by cellists Casals and Piatigorsky, pianists Rubinstein and Rachmaninov, violinist Heifetz and others. Thanks to the Boston Symphony Orchestra led by conductors Stokovsky and Kousevitsky, as well as the joining of Toscanini and others, RCA has become a famous trademark of classical music. After 1934, the development of electrical recording greatly improved the quality of recording, and the scale and output of RCA also increased rapidly. This situation reached its peak in 1941. During World War II, the production of record raw materials was reduced, and the phonograph factory and recording industry were requisitioned by the military. The record industry entered its second bleak stage. RCA, which already had considerable strength, struggled to survive the storms of war and remained standing. After the war, Columbia developed the 33.3 rpm LP record, which brought another revival to the recording industry. RCA then joined the LP camp and performed very well. Its New Orthophonic pressing technology was well received at the time. In the 1950s, RCA launched the Living Stereo series to compete with Mercury's "Living Presence" records. In the 1960s, RCA launched the Soria and Dynagroove series, pushing stereo recording to its peak. In the 1970s, with the depression of the global classical record market and the challenges of European brands, RCA's classical records had lost their former glory.