Okay, I am not sure what or when it happened but I used to be able to import mp3 files into Audacity so I could do whatever I wanted with them. Now I can't and I haven't been able to really find a solid answer on how to solve the problem.

All I want to do is normalize two songs then concatenate them together so I can import the concatenated file into ManDVD so I can assign it to a slide show I am working on. I do not want go and convert to .ogg or any other format, I just want to do two steps get my task done and move on. Is there another application in Linux that will allow me to do this or how do I get Audacity to allow me to import my mp3 files?

Thanks.