Motorola V400

i used tagtag to create a simple WAP site to download graphics and ringtones to my v400. The graphics worked perfectly. Unfortunately tagtag doesnt allow for uploading mp3 format to their site, so i used another host for the mp3 file i wanted to download and created a simple link on my WAP site for the mp3 file. When I go to my WAP site from my phone, it downloads the mp3 file, but then it says it's not recognized. I've tried numerous times and it still won't work. The mp3 file is about 50k and it's definitely an mp3, what am i doing wrong?