Aye. Slowing down pop and soul hits of the time and spicing them up with some acid classical touches, four-part harmonies and dynamics ranging from featherlight to piledriving were their thing.
When I first heard their version of "Some Velvet Morning" it blew my mind:
At the time I had no idea the composition was brought to us by the same folks behind "These Boots Are Made For Walkin'";* neither did I recognise the motifs lifted off Stravinsky's
"Rite of Spring". How such a mixture manages to have the side effect of preluding the doom metal genre still escapes me. And it works wonders even with the guitar taking a step back in favour of the distorted bass. I hear the seeds of both "Black Sabbath" (the song**) and "No Quarter" in there. Of "The Court of the Crimson King" too. Led Zeppelin toured with Vanilla Fudge, as infamously referenced in Zappa's "[Invalid or Expired Link Removed]". Deep Purple and Uriah Heep were superfans; the former's progression from genre-dropping, Beatle-
ralentiing psychoprog to Hammond metal was basically a reenactment of the Fudge's. Jeff Beck was too, well before joining Bogert and Appice. I'd bet Yes too took a close listen.
* [To be fair, Lee&Nancy's original is
weird too.]
** [Also to be fair, that one also takes an obvious cue from Gustav Holst's
"Mars, the Bringer of War".]