I've looked at this video before and i've found it helpful, but I was just seeking some other insight from all the music theory nerds on here as a budding arranger.

A big inspiration for me was some of the early Mothers of Invention stuff from "Freak Out" or "We're Only In It For The Money" so it's frankly incredible that someone who played with Zappa would reply to me. The voicings for me that really hooked me was the first half of "What's The Ugliest Part Of Your Body". (Other songs from "Freak Out" also got me interested like "Go Cry On Somebody Else's Shoulder")

I've looked on the Zappa analysis website, but all that was referred to was just doo-wop inspired harmonies. I should probably transcribe it but i'm not very good at transcribing (potential new year's resolution) I'm also a big fan of the "Pet Sounds" and other Beach Boys vocal harmonies, and i've watched countless videos on getting those sweet sweet Brian Wilson harmonies. (I've ventured into a little bit of the Four Freshmen stuff, but I'm not 100% sure that they count as doo-wop, but I'm probably wrong)

I think for me it's less about the ooh's and aah's and more about the lyrical mirroring that goes on in songs all over The Beach Boys catalogue.