As far as I know from experience on my own ipod/itunes, each ipod can only sync with a single itunes. So no, you can't put music from your brother's itunes onto your own, unless you copy the music onto a disc or flash drive and make your own playlist on your own itunes.
Also, I'm not one to really care about the whole artist thing, so I can't really tell you. I mean, overall it doesn't change the quality of the song, does it?
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