Music track separation.... possible?

Hello all, i have a question. i would like to separate the tracks of music files so i can hear the separate instruments.... i don't mean like track 1 or track 2, i mean like bass track and such. is that possible? and does anyone know of a convenient program to do such a thing? is it horrendously illegal?

thanks in advance

you need a wave editor or something in those lines
it won't be as easy as just picking out the differnet tracks, it'll show the different wavelengths / frequencies so you can seperate them, high notes, low notes

soundforge is probably a good start, it's a small package, other ones are sort of advanced