iPod - Need help about my phase game on ipod classic!!!

I bought that game and install it on my ipod, once i sync the game again on another computer(i thought it was just like reinstalling the game again),but i found that all songs i dragged into the phase list cant be played in the phase game! i cleared the songs in the list and dragged the same songs again into it, but it didnt work at all!!!

really need u guy's help ,cause i cant play any songs i like in the phase any more!!!!