ive had issues like this, if you use winamp use alt + 3, then delete the IDtags info, the song will 90% play then in game, other wise, the song could have a dynamic sampling rate, it would then have to be converted to a fixed rate, eg :128kbs Ive also done seemless looping music edits, this requires wav format for best results, but larger file size, you can get the effect with mp3, but there will always be a second delay on the restart of a track