It appears that every song for every user account on Muxtape has been replaced with the song “Aim (with Stephen Jones) - Good Disease [Babybird does a Prince thing]” including my own bcarlson.muxtape.com
Was it hacked?
UPDATE:
According to the blog, yes, it was. From the blog: “This afternoon, someone gained access to our server and caused some problems. We are investigating and will have more information soon. I’ve taken the site down temporarily as a precaution. Thanks for your understanding, watch this space for an update.”

