User blog comment:Viper 121/Minor Steps/@comment-6844245-20130312031140/@comment-5299683-20130312195746

Just for shits and grins, I'd say try converting it using audacity, simply because it's never let me down. It's a free program, so you've got nothing to lose.

http://audacity.sourceforge.net/

Once it's installed, just fire it up, go to Project, Import Audio and open up whatever song you want. Then go to File, Export as Ogg Vorbis. Once it's converted, go ahead and plug it in the bgm folder as ero1.