Yeah, mainly because his girlfriend got documents against Brian's psychiatrist that he was being given wrong drugs and being handled to the benefit of the doctor. Once properly diagnosed and with the correct drugs, he returned to pretty much normal. People call him a genious song writer, but other than a couple songs on Pet Sounds, I don't see it. I think his genius was his arrangements with the harmonies of the other Beach Boys. I've seen them live many times, and the harmonies are mesmerizing.
Pet Sounds is one of the greatest albums of all time.