If you want to join several mp3 files into one big mp3 file, you might want to take a look at Merge MP3. It is a free mp3 merger that you don’t need to install to use it. Just run, add the mp3 files you want to join, and hit the merge button.
Merge MP3 is an application that was designed with simplicity in mind. In other words, it was designed in such a way so that anyone can use it immediately once they run the program. You can join mp3 files as many as you like, optionally write ID3v1 and ID3v2 tags into the joined mp3 files, optionally write VBR frame into the merged file, and you can also view information like MPEG header and ID3v1 and ID3v2 information for the joined mp3 files.
The mp3 files that you add to the list will be joined without quality loss. If you often need to join your mp3 files, this utility will surely be a big hand for you. If you’re interested, you can download it here.