Obviously, our first reaction is using a M4A joiner. WonderFox HD Video Converter Factory Pro is the best choice for you. Besides, the tool can help you to combine songs into one track. Of course, you can convert M4A to other audio formats like M4A convert to WAV, or convert M4A to FLAC. Then, we will show you how to combine M4A files within 5 steps. Before the detailed guide, you should make sure that you have already downloaded and installed the software on your Windows computer.