Apple recently announced their new Apple Music Store, which allows Mac users to download music using the iTunes software. Tracks cost 99 cents each, and full albums are about $10 each.
I tried downloading a track I already own on CD, to see how good the sound quality was. At first I was worried, since the downloadable tracks are in 128 kbit/sec quality (relatively small). But Apple's using the new Dolby AAC algorithm to encode the tracks, and the quality isn't bad. Tracks sound a little bit tinny, and cymbals sound watery. But overall, it's pretty good.
Oddly enough, I've been downloading mostly sentimental early 80's tunes, such as "She Blinded Me with Science", and "Burning Down the House". I'm not as concerned with the sound quality since these tunes aren't recorded that well to begin with. And it's a lot cheaper than going out and buying a whole album from one of these artists, which I'm not going to do.
This is a great music download service, and hopefully Apple will expand its catalog to include more obscure artists.