Nero or whatever CD ROM burning software you have; can convert
MP3s-->WAV-->CDA and create an audio cd. You will lose some level of frequency range but it usually not all that noticeable...

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Current Cars:

2008 X5 4.8i - Blk/Saddle
2001 330Ci - Titanium/Black Sport/Premium

Past Cars:
1993 325is Blk/Blk Sport
1995 M3 Blk/Blk
1997 328iC Blk/Blk Sport/Premium
1998 M3 Silver/Black
2001 M5 /Black/Black/Sport
2005 X5 3.0i - Blk/Blk Sport/Premium