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This is something I noted with a direct out-of-the-box Redhat 6.0 system. It has an easy fix. The version of x11amp shipped with RH 6.0 is an alpha version; the beta is now available (and has been for some time). The alpha version will not play MP3 files from a vfat, msdos, iso9660, etc. filesystem; it will only play MP3 files from a second extended (linux native) filesystem. The beta version currently available at the above URL fixes the bug. You may want to create an RPM binary for the beta and make note of the fix on the General Errata page for RH 6.0.
Works with the xmms in Raw Hide.