Garnet Mimms was the guy I was thinking of. He's somewhat extraordinary, because although he is considered 'northern soul' which I take to mean white british guys singing black soul, he was a black dude from the states who never got the fame here that he deserved. The song As Long as I have You is brilliant, he worked with Jerry Ragavoy, and also was the first to record 'Cry Baby,' made famous later by Janis Joplin. I can't remember how I got turned on to him, apparently he was an influence on Robert Plant, who covered his stuff in Band of Joy, and Mimms also worked with Hendrix in the UK.
Unfortunately, original UK copies of the LPs are pretty rare and pricey these days.
On the psychobilly front, there was a woman from Boston we used to love going to hear- Sarah Borges- who had a killer band. They broke up a few years ago and now she has a solo career and has changed gears.
I also dug one song from Elvis Hitler, from the Disgraceland album- his cover of Purple Haze, with the lyrics from the Green Acres TV show, predictably entitled 'Green Haze.' Have the original vinyl release that I bought back in the day at CBGB's, when they had a record store.
The Yardbirds covered Garnet Mimms track My Baby...he was very popular among British blues rockers in the mid 60's. Good one!