It depends on how you define "stealing". In using the torrent route you avoid the one that would give money to the creator. It's hard to pin it as stealing due to it not having a physical representation, but you can use comparative examples to bridge this gap.
Think of it like this. You go out to a art festival and buy this very expensive and artistic mug that you really enjoy using in your daily life. You know that other people would also enjoy this, and so you wrap it in plaster to create a mold. After a while when the mold is complete you fill it with slip (aka soupy clay) and eventually create a carbon copy of the mug. In the following week you then take this mug to that festival, but not so s/he'll see you, and you sell it off to people for free. This way everyone can enjoy the mug, and maybe you feel good saving them plenty of money.
The difference in this example is the stealing is a co-conspiring act. It's not just the person creating copies that is the one at fault, but also the person who buys them knowing that this knock-off would save them a large amount of money. Obviously if you didn't know about the original mug you could be pardoned for ignorance, but you can't apply this to downloading music or movies (but if you could then you must be the same mom/dad/old parent who doesn't know crap about computers)
So is it stealing? Well obtaining it in a illegitimate way not only saps the creator of their source of revenue, but also gives sanction to those that copy & distribute such sources. However if you can sleep with your ethical choice then hey that's on you.