I've just gone back and listened to son of a preacher man on a good pair of cans.
Sounds like everything is panned hard except for the lead vocal.
This even extends to the bass (panned left) and the drums (right.) Sounds like there is a hammond playing in a very low register on the right (at least to start with) to balance up the low end.
am I right that the lead vocal is the only thing not panned hard? I've never noticed it before on this record and it surprised me. A lovely piece of work.
not a complete hijack, because clearly panning limitations are inherent in certain eras of music and need to be considered.