Maynard James Keenan (Tool, A Percect Circle--incredibly powerful voice, but he can still sound pretty when he wants to 馃槉 )
Brandon Boyd (Incubus)
Cristina Scabbia (Lacuna Coil--same style music as Amy Lee but with a much stronger voice and much deeper lyrics)
Annie Lennox (Eurythmics, but she's better solo IMO)
I like the following:
Jennifer Lopez, Usher, Christina Milian, Christina Aguilera (some), Britney Spears, Evanescence, Van Halen, Nelly, JoJo (some), Snoop Dogg, Ashanti, Beyonce Knowles, Destiny's Child, Pharrell, Lil Flip, Missy Elliot, Ciara, Petey Pablo, Alicia Keys, Madonna (some), Matchbox 20, Queen, Coldplay, and that is all that i can think of at the moment馃槈
Rebecca