I just installed Ubuntu 9.10 on my desktop. When I tried to play some mp3 files with Amarok 2.2.0, it didn’t make any sound though it played ogg without a problem.
Thanks to this post, mp3 play back can be enabled by installing libxine1-ffmpeg.
$ sudo apt-get install libxine1-ffmpeg
Credit: How to Play mp3 files with amarok in Ubuntu Linux 9.04
Kenno's openNOTE 
Thanks…
Thanks!
Use GStreamer to get rid of the 24-bit flac problems in Amarok and also get mp3, and wma working flawlessly.
Ever since Apple came out with the IPod, there has been nothing but excitement for the future of digital music players. Even though Apple still rules this marketplace, there are other MP3 players that are out there for you to use as well. Some of these MP3 players also let you carry around more digital files than just music. They will let you use the device as a thumb drive storage system as well. This is very convenient but it can also have a downside that comes with it. With the ability to use the devices in this manner, they can also be used to spread malware to other systems. This is why you must be careful when you load different files into these MP3 players. Even some of the MP3 files that you load into system may be carrying malware in them.