"I like classical music but the synthesizer is really irritating and ruins it for me." You have to listen to it with your ears set to 1968.....a revelation at the time, and the start of the whole "Moog Music"
record craze! And as Adam says, the quad mix is very well done. John
Viewing this as a novelty record which started the "Moog Music" craze is damning it with faint praise. Not that there isn't an element of truth in the comment - Carlos took painstaking care in developing timbre and voicing. The results are astonishing considering that polyphonic synths were not yet available. Of course the record label's approach was the ridiculous but now iconic cover of the foppish Bach. I would say look further than the cover and listen carefully keeping in mind the technical limitations of the day - stunning really!