Here is a cap with a few different methods of loading and "looping" sounds/music in either WAV or MP3:
https://dl.dropboxusercontent.com/u/4714446/LoopMus.zip
The music commands do have a delay, and autoplay resource on an MP3 seems to fail, but otherwise the others are looping fine on my desktop (Win 8.1, 64bit, 8GB DDR3 RAM, NVIDIA GeForce 210 1GB DDR3 VRAM).
Hope that helps! <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">