This earliest recorded version of Edgar Sampson’s swing standard features Teddy Wilson on piano and Sid Catlett on drums. It was produced at the fourth documented recording session credited to the Benny Carter band. The also-posted 78 flip side is “Lonesome Nights” ( https://www.youtube.com/watch?v=MwNFcDwf9cU )
From 78rpm (UK) Columbia CB-720, original U.S. issue on OKeh 41567 - Blue Lou (Sampson) by Benny Carter & his Orchestra, recorded in NYC October 16, 1933