All audio sounds like The Chipmunks

Does anyone here remember The Chipmunks, who recorded some Christmas songs in a high pitched squeaky voice?

Well, all of a sudden all of my .mp3 files sound like The Chipmunks (high pitch and speeded up playback. This happens whether I play the track through the Music app or if I play it through QuickTime. Additionally, clips on Facebook sound like this.

Same goes for the Podcasts app.

[Edited by Moderator]