Well, I don't know about vocal range.
I'm sure they did not use all their vocal range in the songs.
But I can tell you that, actually, Lena Katina is a Soprano and Julia an alto, or at least I think Julia is an alto, cuz her voice is, actually, husky and with a darker timbre, I'm sure she can reach good low notes.
I'm sorry, I can't help you more =X
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rons vocal range is eight octaves.
I believe Mr Warlow's vocal range is Tenor to Baritone.
Amazing!
Soprano
She is a Mezzo-Soprano, with a 2 Octave Range