BGM Loop !!!!!!!!!

i search google, forum, youtube etc. etc. 4 day, and nothing , how we can loop the BGM , if i create my bgm over 3 min ( wave for sure ) crash....
so i search a mod, or trick how loop the BGM
if i can loop the BGM i create a MOD fairy tail i create my opening and logo preview





logo here : View image: usa splash

alll work for now but only the bgm i search , if you can help me, i post my MOD , all OST epic fairy tail and bleach

all bgm changed town, quest, scene,

Err...why?