This one:
$ dpkg -l | grep mpg
ii libmpg123-0:armhf 1.14.4-1 armhf MPEG layer 1/2/3 audio decoder (shared library)
ii libmpg123-dev:armhf 1.14.4-1 armhf MPEG layer 1/2/3 audio decoder (development files)
ii mpg123 1.14.4-1 armhf MPEG layer 1/2/3 audio player
fails to decode mp3s correctly.
The current version is 1.22.4. I know 1.21.0 also works. I had to build from source.
I'm guessing wheezy is too old to be updating apt packages for, but I thought I'd mention it.