I'm not sure how much, if at all, this trio penetrated into the US market but during the 60s and 70s in the UK, they were on TV quite a lot on various variety shows. I was too young to appreciate them first time around but just rediscovered them and my God, what a band.
Roy Phillips is great organist, who actually started out on guitar for Joe Meek's sessions. Anyway, here are a couple of vids, the first is interesting in that Roy's playing a Lowrey Berkshire, as used by Pete Townsend, and I think the wah effect is built in to that model. Second is on a Hammond (model?) but also hot as hell (love the drummer's stick-twirling).
[video:youtube]
[video:youtube]
Edit: well, they penetrated the US psyche enough for this to be used on Breaking Bad, it appears...
[video:youtube]