Nowadays, MP3 is one of the most popular audio formats. No matter songs or speeches, most people choose the MP3 format to save their tracks. But some contents may include commercial parts. In that case, people may wonder to find some MP3 cutters. There is still another situation. Someone may want to listen to the lectures when commuting. If he combines all his favorite addressers' speeches, then he doesn't need to watch his device frequently when walking, which is dangerous. In short, cutting or merging MP3 is becoming a significant need. To help you accomplish the task easily, this article will introduce top 4 MP3 cutter and joiner, including free online and offline software.