Chiimes

Oh.. im almost understanding all the modding and stuff now. Anyways, now have 3 songs for Jst Dance 2k14, actually im still downloading them at the moment.
I just want to clear something from the info that ive learned through my researches.
I have xexmenu 1.1 installed in my xbox already. now im downloading horizon, and for no reason, the download always errored. can anyone please suggest where to download alternatively horizon, and explain what does it do or what importance does it give upon the installations?
 

I have a JTAGGed xbox 360, and I want to add new songs (DLC) onto my just dance 2k14 and 15. I dont know how to do it.. even a single thing, Im really clue less. Can anyone, with an open heart, teach me step by step the instructions on how to do so? any help, small or big, will be greatly appreciated. tnx :3