The two tones are (spaced) an 'octave' apart.
He sang the song an 'octave' lower.
(..) You sure did... aaa's. And in six months, you'll have to check 'em again... Won't he? And you're the only baritone in the elf choir. You bring us down whole octave. In a good way. See, buddy? You're not a cotton-headed ninny- muggings. You're just... special. And so, buddy was sent where the... Ah! (..)2003 Elf