All the MP3 files you find on EMusic.com can be played using FreeAmp.
FreeAmp plays MPEG-1 (layer 2 and layer 3) and MPEG-2 audio files, including HTTP-based streams such as SHOUTcast, icecast, and RTP-based streams such as Obsequiem.
FreeAmp plays files created with CBR (Constant Bitrate) and VBR (Variable Bitrate), the very latest encoding technology.