Total Noob Needs Help With Samples, Garage Band Options

[RHfangirl]

Hello. I am totally new to any of this. I hope I'm posting this in the right forum. Sorry if I'm not. Anyway, I just started playing with Garage Band. What I want to know is if I can take a sample from a regular song and isolate one instrument. For instance, if I want to use a bass line from, say, Joy Division, am I able to zero in on just that, without the drums or anything? I've been teaching myself how to use Garage Band and haven't really found anything to address this issue. I don't even know if it can be done, but I figured all of you would know. Thanks for putting up with the noob.