So you’re putting your music online. You’re going to make it available to people, and now you have to make a decision about what file format you’re going to use, what encoding rate, and what sort of file size you’re going to subject your customer’s bandwidth to.
There are two answers to this question. The first is the ‘it depends’ answer. You can do a whole lot of calculations about your own bandwidth and budget, expected download popularity, server space, etc. You can make allowances for all the different online retailers and the file types they use.
The second answer is really simple and it applies when you’re selling your music from your site. It doesn’t depend. And while I’m buying myself another argument here – I’m going to say that right now, I reckon this is the best answer for online music file types.