HELP! wif iTunes? plz?

a while ago i bought a soundtrack from iTunes but my computer had a virus so it shut down every 2 mins and when i tried to drag n drop my music to my ipod it was working fine until it shut down and i never saw it again now i cant find the reciept and i cant get my music back! does anyone know how to get a reciept back?? (oh n now my comp is fixed so i can download stuff fine) HELPPP MEE plzz:)