Apple has confirmed the rumors that iTunes will be moving to a variable pricing structure. Top tracks will carry a $1.29 price point, while other, less popular songs will be available at $0.99 and $0.69. Along with the new price points, all tracks on iTunes will be DRM-free by April. So who are these changes good for? For one, the record labels, which stand to make more money on releases from expensive, top 40-type artists. Meanwhile, as I wrote last night, the drop in prices is good for consumers whose musical tastes fall more into the long tail of iTunes’ huge music catalog. But, for the millions of people who fuel downloads of iTunes’ most popular tracks, this change marks a 30% price increase, which, adds up to a lot of money on an annual basis.