Scrambling over tight profit margins, online music stores are merging or selling themselves off. Remember that the reason iTunes grabbed so much market share is because their focus is on selling hardware -- the music is a break-even proposition for them at best. Even though you can place your music on these services with the help of folks like CDBaby, you're still responsible for driving your listeners to find your stuff. And you can still sell MP3s on your own site, too.