The bitrate is the frequency at which your Mp3's were recorded. The higher the bitrate, the higher the quality although the more space it takes on your hard drive. 4Musics MP3 Bitrate Changer modifies the frequency of MP3s by simply allowing you to right-click and change it to the frequency of your choice.
In addition to this, it features a label publishing option that allows you to enter the data of the song, artist, group, genre etc. In order to make conversions simultaneously, you can leave a whole batch of MP3s for automatic conversion whilst you do other things or just leave your PC running.
If you regularly need to to alter the frequency of your music, then this is an incredibly quick and efficient way of doing it. However, once you go beyond 192Kbs, there really is little difference in sound quality and the space they take up on your hard drive or external device after that is way too much.