[Harp-L] Key of "AB"??

[Michael Rubin]

I would assume A flat

On Tue, Mar 21, 2017 at 10:53 AM David Fairweather <dmf273 at xxxxx> wrote:

> In perusing the online inventory of some major music retailers (Guitar
> Center,  Musician's Friend), they often show harmonicas in the key of "AB".
>    I know they don't mean "B" because they show those separately.   They
> also have separate listings for natural minor and  country tuning.  So what
> the heck do they mean by "AB"?
>