It begins on the Dominant 7th, with the Tonic as the next chord. (Often this pattern is then repeated before further developments.) To put it simply, if you’re in the key of C, you begin these tunes on G7th (usually two bars) and then move on to C.
Do What Ory Say
His Eye Is On The Sparrow
I Wish I Could Shimmy Like My Sister Kate
Miss Annabelle Lee
Way Down Yonder In New Orleans