MP3 Cutter and Joiner is a piece of shareware for splitting an MP3 or WAV file into several smaller MP3 or WAV files by milliseconds or bytes. MP3 Cutter and Joiner also supports joining several MP3 files into one MP3 file, or several WAV files into one WAV file. MP3 Cutter and Joiner is a piece of shareware that has a one-time registration fee.