The title is a double-entendre. Ozzy is singing about two simultaneous changes in his life: 1. He's going through a breakup with his longtime girlfriend/wife. That's obviously a big, painful change for him. Change # 2 is the psychedelic change that's occurring to him as he's tripping balls and thinking about the breakup. This aspect of "changes" is the drug-induced hallucinations that cause the world around him to "change". That's why the song has an eerie feel and the refrain has a magnified double-tracked vocal. It accentuates the psychedelic effect to the drugged listener.
The title is a double-entendre. Ozzy is singing about two simultaneous changes in his life: 1. He's going through a breakup with his longtime girlfriend/wife. That's obviously a big, painful change for him. Change # 2 is the psychedelic change that's occurring to him as he's tripping balls and thinking about the breakup. This aspect of "changes" is the drug-induced hallucinations that cause the world around him to "change". That's why the song has an eerie feel and the refrain has a magnified double-tracked vocal. It accentuates the psychedelic effect to the drugged listener.