soundtrack is causing problems on everything

im having a wierd problem. as you all should know, brawl released recently. so i wanted the soundtrack. i found it and downloaded it. but i want it in wav format. so i tried using Audacity -- i could upload it, then reexport it in wav. simple right? well, i discovered that, if i try to import it, it reads the data wrong or something. when i play it, it has this awful sounding pop at the beginning and then the whole track is about double speed. so, i tried Switch from nch. when i try to convert, it immediatly says there is an error. so i decided to check some other songs. i later discovered that, ironically, the only songs that do this are the ones i downloaded in that soundtrack! and wats wierder is that, when played directly in mp3 format, there perfectly fine. can u guys tell me wat in the world is going?!!