You realize it takes money to create music, right? As well as time, which is money, considering that career musicians don't get a salary, usually. And if what is really going on is simply that people download low bitrate music for free to find what music they like (which in the days of Spotify, Grooveshark, and Pandora seems a little unjustified), simply so when they find what they do like, they go out and buy the music at high bitrate, I'd have little to no problem with that. And when you buy music, it's really best to buy it as directly from the musician as possible. In the internet age, this is quite easy. They all have websites.
Also, consider that money has little to no material worth in itself. Stealing a 100 dollar bill would be quite similar to steal a 1 dollar bill, looking at it that way. Also consider that a lot of money has NO material value (credit, stocks, bonds).