7 octaves! NO WAY!! Mariah Carey can't even hit 7 octaves, I think she can sing 6 octaves and she's known for that. Because she can hit the highest notes on a grand piano, but not even Pavoratti can sing the lowest notes on the piano. And I am pretty sure a piano is 7 octaves, 7x12=84, and grand pianos have 88 keys. Maybe he can do it, but I'd have to hear it.

And yeah like az said, Id suggest getting a vocal coach if your serious about singing.