"I Didn't Know About You" is a song composed by Duke Ellington, with lyrics written by Bob Russell.
The recording by Count Basie & His Orchestra (vocal by Thelma Carpenter) briefly reached the No.
21 position on the Billboard charts in 1945[2] and other recordings available that year were by Duke Ellington, Mildred Bailey, Jo Stafford and Lena Horne.
[3] Alec Wilder wrote that it "works well as a song in [the] series of Ellington instrumentals with Russell lyrics.
"[4] (The other two songs were “Do Nothing till You Hear from Me” and “Don't Get Around Much Anymore”, based respectively on "Concerto for Cootie" and "Never No Lament".)