Mp3 Compressor allows you to reduce the size/weight of your MP3 files in a way that damages the quality of the sound file, but that maintains enough sound quality to remain usable. You may convert your files in batches, and the software supports more than just MP3 files.
Software that compresses sound files
Mp3 Compressor is an old piece of software from a time when MP3 players had little memory, and from a time when downloads took a long time because of poor Internet speeds. The software is able to lower the size of MP3 file, Flac files, Wav, Ape, Wma, ACC, WV, Aiff and M4a files. It works with a drag-and-drop interface that makes loading a little quicker and more convenient. You may convert in batches too, and your original file remains untouched because it generates a new file when you convert.
A tool that may suit app developers
Pushing the price aside for a moment, the Mp3 Compressor feels a little redundant these days when MP3 players have the same amount of memory as year 2000 laptops. The need to compress music files is slowly disappearing. However, there are still game developers and app developers who may like to add a series of sounds and soundtracks to their apps while keeping the size/weight of their app down. You will have to pay for this tool, and there are others on the Internet that are free, but all sound-file compressors are going to damage the quality of your sound file in one way or another.