Primarily used by iTunes between 2003 and 2009.
If you're referring to an audio or music-related product or technology, such as a portable music player or a specific audio file format (like MP4, which can contain music or video), here is some general information: the undertone m4p
Then, a voice. His mother’s. But not the cracked, tired voice from her last years. This was her voice from when he was five, singing him a lullaby in the dark of a thunderstorm. He smelled her perfume. Felt the cotton of her sleeve. Primarily used by iTunes between 2003 and 2009
Usually encoded at 128 kbps, which provided a balance between file size and "near-CD" quality for early 2000s bandwidth. The "Undertone" of DRM: Why It Existed But not the cracked, tired voice from her last years
He gasped, ripping the headphones off.
Subscribing to iTunes Match allows Apple to scan your library. If it finds a match in the current iTunes Store, you can download a DRM-free, high-quality M4A version of your old M4P tracks. The "Burn and Rip" Workaround A classic, albeit tedious, method: Burn the M4P files onto a physical or virtual CD.
Behind him, on the scarred table, the Undertone M4P clicked once, its amber light flickering out. Its work was done. Another listener would find it soon.