MP3 Better known as MP3, it is a digital audio compression format that uses a lossy algorithm to achieve a smaller file size. It is a common audio format used for music on both computers and portable audio players. The cost of the mp3 varies for the reason that there are of more quality and of different types etc. This goes for the costs of 3 dollars up to 13 dollars, this for the reason of capacity of memory of music and qualities since there are different brands and types of mp3. The reason why mp3s are expensive since they are good for athletes are small and comfortable to use, this makes them more efficient in their capacity and according to their creators mp3 was the largest music network in a long time.