If its a cd that you have it will not have a dvd music video on it. It will most likely be a macromedia flash video or a quicktime video. In either case the software neaded to play the file will normaly be included on the cd. If it is not. both of the above can be downloaded free of charge, use google to find them.
If however you have brought one of the new music dvd's then you will nead to bye a dvd drive for your computer. As you cannot play a dvd on a cd drive.
Hope this helps
What happens if a big asteroid hits the Earth? Judging from realistic simulations involving a sledge hammer and a common laboratory frog, we can assume it will be pretty bad. - Dave Barry