I'm pretty good at it..guess it's a born ear I'm told by strange people. That and mimicking just about any voice that I hear at least twice. Accents and tones, etc... the whole variety.
Is there a way to practice without lyrics and just music that's not expensive? Thought for kicks I'd do a youtube and you degenerates can have a listen for some laughs.
One of the easiest ones for me is Springsteen.
Badlands might like that one.