Clueless Newbie Questions, Karaokeing recordings. Options

[nickdaum]

My current hard and soft:
Mac G5 dual
M-Audio FireWire Solo
GarageBand
Audacity

I'm not a professional musician and don't intend to be. I just want to start singing and playing guitar Blues on my own as a retirement hobby.
Instead of using loops for the drums and bass backing I would like to use actual recordings of my favorite musicians as karaokes. Is it possible to remove both voice and guitar from a recording? If so how?

Secondary question, a little off topic: I need to buy an electric guitar, not too expensive, possiblly second hand.
As a matter of fact I'll stick to a slow tempo, like Blues does, so I don't need a "fast" guitar. I don't care about the look or the shape since I find them all ugly whether Strato or LesPaul or whatever. I don't care about accessing the highest treble notes.
I care only usability and sound.

What are the specs I should put on my list? Any brand you would recommend?

TIA

Nick

[nickdaum]

Hi

It seems the guy is not for the electric thing.
My intent is to plays blues. I don't like classical spanish music that much and it seems it needs virtuosity I doubt I'll be ever able to achieve.
I like the slow tempo in blues and an electric guitar seems to me more suited to get the sound you find usually in blues.

Of course the downside is that it needs a lot of hardware around to make it work. You can't just sit somewhere and play. I saw some guitar can have a headset plugged directly into it though.

Nick