I read that story in the 80s, although it might be older.
It starts with a young genius who becomes a rock star. He's out practicing in a field, singing to a flower, when he realizes that he's sensitive enough to hear the flowers' vibrational reaction.
Next, a major city in the USA and one in the USSR are threatened with annihilation if the super powers don't disarm their nuclear and psychic weapons.
A major and a woman are consciously elevated when they find the singer's body in a coma at a (pre?) cryo facility.