I used Audacity to convert an mp3 file to a .wav file (import mp3, export .wav) and saved it as Coldplay-Message.wav . then I used
W = wavread('Coldplay-Message'); wavplay(W)
I didn't add the .wav in the filename, but instead of playing the song, it plays this horribly creepy soundtrack, with some creepy voice groaning and some scary music. What happened??