Rayman Pirate-Community

I have downloaded a rayman music in my Ipod. After few hours All files of Rayman music had been corrupted. I have downloaded again but same problem comes again. I have no problem with other music. Would you please tell me what's wrong going with my Ipod or rayman music?

I have

Rayman Forever
Rayman 3
Rayman
Rayman 2
Rayman Gold
Rayman Revolution
Rayman Advance

I love all song of Rayman and I am a great fan. I have collection of all song of rayman. But from all my collection i love Hoodoo and heckler theme. I hear this song daily at night.