As the Depression worsened, the recording industry was in crisis, dropping over 90% of its artists by 1933. Ivie Anderson was hired as the Ellington Orchestra's featured vocalist in 1931. She is the vocalist on "It Don't Mean a Thing (If It Ain't Got That Swing)" (1932) among other recordings. Sonny Greer had been providing occasional vocals and continued to do in a cross-talk feature with Anderson. Radio exposure helped maintain Ellington's public profile as his orchestra began to tour. The other 78s of this era include: "Mood Indigo" (1930), "Sophisticated Lady" (1933), "Solitude" (1934), and "In a Sentimental Mood" (1935)