With AllPepole Video Merger, you can merge multiple MP3 files into one, while preserving all of the ID3 tag, without re-encoding audio on Mac or Windows.

Step 1. Import multiple MP3 files
Click "Add File" button to import your MP3 files into one. Or select all MP3 files or MP3 audio file folder location, and then drag and drop directly into MP3 combiner main window.

Step 2. Combination of MP3 files
Click "Merge" button, MP3 files will automatically appear after the merger of the following MP3 file name such as "merger 1." Double click merge, you can rename your MP3 music or audio merge.

The third step is to select MP3 as the output audio format
Click the "Profile" drop-down button to choose MP3 as the output profile from the "General Audio" category. Click the "Settings ..." button to open the "Advanced Settings" window, and then switch to the "Advanced" tab. Double-click the right side of the MP3 audio codec to open the drop-down button, and choose Copy.

Step 4. Merge MP3 files without re-encoding
Click the big round button on the bottom right of the main window of MP3 craftsmen.

Free download at app store:
https://itunes.apple.com/us/app/my-merger-free/id944170835?mt=12