Sonny of course used this technique frequently but his showcase number had different titles at different times. On the LP "Long way from home" recorded in 1969 it is Wailin' & Whoopin' ;on a 1989 CD reissue called Midnight Special (reissue of 1960 LP Blues and Folk) it appears as Sonny's Squall and this is closest to the advert version of the recordings I've got. His 1947 version of "Whoopin' the blues is similar but has quite a different introduction (issued on CD as Whoopin' the blues:the Capitol recordings 1947-1950).


RtS
(fortunate to see them twice live in the 1970s)