I play harmonica, but I would not say I'm super savvy about the intricacies of them.
Harmonica appears all over Beach Biys records, perhaps most famously in its orchestral bass form, but I'd like to do a quick survey of all notable Harmonica parts. Where I could use input is, A) reminding me which tracks one's on; and B) lending an ear to the different types.
Eventually, I want to do a video or two on harmonicas in Beach Boys music, so it should be constructive.
Also, it could be fun to talk about the early session harmonica players, Cappy Lewis and Billy Riley, as well as the stalwart Tommy Morgan.
Right now I'm concerned with When I grow up and (Today's) Ronda. The harp on When I grow up sounds like it could be a tremolo in Ab, and Ronda seems likely to be Diatonic in Ab so as to play on the draw in Db/C#?
THOUGHTS!
I am a pretty decent harp player, played in various bands (and as a vocalist/songwriter) over many years but in a rock/blues/country style pretty much. So I don't have a lot to offer on what you put out there other than you are obviously aware of "cross harp" and yes D flat would be the subtonic "draw" harp to A flat. And I certainly love Brian's use of harmonica, particularly the bass harmonica.
Side note -- I recall Rod Stewart once cracking "the harmonica, the cheapest instrument you can buy." Recently I did an inventory on my harps and realized I owned close to a hundred (mostly regular harps). At $35 - 45 (or more) a pop I figured that would be in the neighborhood of $4000! Could get a fair guitar for that I imagine.....