Sample songs

[lisasolomon]

I am interested in buying voice eliminator software that I will use to create CD's for my daughter. She is 11 years old and loves to sing but she gets frustrated with background music and wants the music that she hears on her CD.
I would appreciate it if someone could send me a sample for Sarah McLachlan's Angel or Kelly Clarkson's "A Moment Like This".
or Christine Aguilera's "I Turn To You". This would give my daughter a good sense if the software works for our needs. I realize that this isn't a perfect solution but want to see if it is "good enough".
In purchasing this software, what are my options? What is considered to be "top of the line"? Are there any surprises? What do I need other than a good PC and CD burner?
I notice that there are voice eliminator services. What kind of equipment do these service providers use? Can they provide superior results than a non-professional?