[Harp-L] Musselwhite overblowing or alternate harptuning?

[Ludo Beckers <ludobeckers@xxxxxxxxxxx>]

I just listened to Charlie Musselwhite's new cd Delta Hardware, and heard something strange on the last track, Blues for Yesterday.
At 3'58 there's clearly an overblow 6 (G harp) ór an alternate tuning on the top end of the harp.
It even sounds like a 7 overdraw, as a quick passing note, in the lick at 4'06.
 
I don't have the cd cover, since it's a review copy that strangely enough came without booklet.
Maybe there's something in the liner notes about this?
 
I'm just curious because I know Charlie never got into ob-ing, and I'm not aware that he ever used an alternate harp tuning.
Anyone heard about the old dog learning new tricks? 
 
Ludo