cove and anthony are both tenors (for you musical people who know the significance of that)
i like how they have a high range, but like.....i dunno, they can't sing that low, and it makes any variety limited.
now hayley for instance......she can sing pretty low for a girl, and still have tonal quality, and still has a powerful and deep upper range. that's a good range.
cove barely has two octaves, so the type of sound he creates gets to repetitive after a while.
just my 2 cents from an experienced musician/vocalist.