Just one day after Apple upped the prices on music, Amazon and Wal-Mart have done it as well.

It was an inevitible price increase that many have been expecting for years. The Music Industry has been breathing down the necks of all three companies and demanding more money. Apple tried to fight it by threatening to shut down the MP3 portion of iTunes, but in the in the Music Industry won.

Amazon has raised prices to $1.29 while Wal-Mart only went up to $1.24. The only good about any of this is that some songs are now offered a little cheaper as well. Amazon has some for $0.79 and $0.89 while Wal-Mart has some available for $0.64.

Things could be worse, however. There is another technology which may soon infiltrate the MP3 pricing structure. It's called Digonex, and stands for Digital Online Exchange. The company that developed and patented the algorithm, also called Digonex, has already proven it works on an independent online MP3 website called MusicRebellion.com (now defunct).