Preferred type is audio/aac
This mimetype is deprecated. You should still support it, but avoid using it to assign new mimetypes.
Instead, please use audio/aac
AAC (Advanced Audio Coding) is a compressed audio format defined in MPEG-2 Part 7 (ISO/IEC 13818-7), and in an updated form in MPEG-4 Part 3 (ISO/IEC 14496-3). It was designed to be the successor to MP3. iTunes distributes (or distributed) files in this format, apparently including various metadata (like the name, and sometimes email of the account which downloaded it, along with the time it was downloaded).
An AAC file may contain only the raw AAC format, or it may use a multimedia container format such MP4 or QuickTime. AAC is often used for the audio component of a video file.
File types
.aac.m4a
Also appears as
audio/aacPreferred