I think it's a blessing too more than anything. & Melody never strains, she may sing a little over the top, but never trains. She managed to hit E5, F5, & G5 like it's nothing. And she has the craziest Melismatic runs. Like when she sang "Tainted Love" w/ PCD & "Bite the Dust" : http://www.youtube.com/watch?v=gMPgabU95xs

& her just spankin the hell out of PCD songs & other songs by other artist:
her rendition of "Feeling Good" - http://www.youtube.com/watch?v=2bBM1ZCuD34
"Fever" starting @ 1:33 - http://www.youtube.com/watch?v=-2L4IazZa0E
"Sway" starting @ 3:03 - http://www.youtube.com/watch?v=LicPp7LGsD8
her cover of Christina Aguilera's "Hurt" - http://www.youtube.com/watch?v=33CIw0iGmZ8

even her comparison of her "Feeling Good" & Nicole's. Clearly she has the better voice, maybe not range. But, her voice triumphs over Nicole's anyday, and she has mad range too. link: http://www.youtube.com/watch?v=GMx5dGMeLDY