At the moment we only support WAV and MP3 files, so therefore any AAC files (the default format used by Apple) unfortunately do not currently work. We are actively working on a fix to this and hope to have a solution soon.
In the meantime you can convert your iTunes music to mp3 files by following the steps in this link: https://www.lifewire.com/convert-itunes-songs-to-mp3-2000442. We appreciate that this isn't a desirable solution and hope to have a fix shortly.
AH training to the classic tunes of Survivor!