Then in 1930 came the recording What if we do?, (same melody) sung by the niece of Clarence Williams - Katherine Henderson (sometimes spelt Catherine Henderson) - accompanied by Clarence Williams and his Orchestra.
Katherine sings the song in the key of C, with which she is obviously comfortable.
I would not have known this song existed had it not been for its appearance in January 2015 as the latest addition to Tuba Skinny's impressive repertoire. It appeared on YouTube (thanks to the fine video-maker RaoulDuke 504):
As you see, Tuba Skinny have chosen to play What If We Do? entirely as an instrumental number. They take it rather more quickly than Katherine Henderson and Clarence Williams. They also choose to change the key to Bb. And they omit the Verse. In this Tuba Skinny street version, the Chorus (32-bars) is simply played through four times (128 bars in total), with no introduction or coda - no frills, in fact. Barnabus gives a lusty performance on trombone and Todd takes the lead on the second half of the third chorus. It is a typical workmanlike Tuba Skinny performance - thoroughly enjoyable and a lesson to us all.