The Hi-Revving Tongues started off their recording career by trying to be a psychedelic band. Their first single, Illusion, was recorded at a time when there was one (1) known sitar in the entire country, and a different band had first call on it, so they had to improvise. Improvise they did, by doing weird things to guitar strings and tuning and effects and coming up with quite an odd sound which didn't really sound much like a sitar, but didn't sound much like anything else either.
Unfortunately this band, although one I never thought was that obscure, don't even have a stub on Wikipedia; the best web site I could find at short notice with information about the band is here. In their day they were most famous for a version of Rain and Tears, but this song below, Tropic of Capricorn, is (1) a better song, (2) as far as I can tell, it's an original (although if it isn't I'd like to know who wrote it so I can track down more of their music), and (3) I actually recall hearing a few times on the radio back when I was young. It's also on a CD I really need to get back one of these years off the friend I loaned it to.
Anyway here, courtesy of You Tube, are Chris Parfitt - vocals; Mike Balcombe - lead guitar; Bruce Coleman - organ; John Walmsley - bass; Rob Noad - drums.