Music File Merger is very easy to use, and is enormously powerful to work with music files. It can merge up to 1000 MP3 files (yes, you read correctly, one thousand) into only one individual MP3, so you can manage it easier, or listen to all the music together.
Music File Merger is a manageable size, its interface and panels are well designed, and together make it a simple, agile and speedy program. It is also totally free, with no additional costs nor limitations. It works on any Windows platform.