To download your purchased music as M4A files on a PC or Mac, you must use the iTunes app or the Apple Music app, depending on your OS version.
To download M4A files from iTunes, follow these steps: download itunes m4a
Notes:
When Apple launched the iTunes Store, they championed M4A (specifically AAC encoding) over the aging MP3 format. The result? Crisp, clear audio that takes up less space. Unlike MP3s, which cut off high and low frequencies to compress files, M4A files generally preserve more sonic detail. To download your purchased music as M4A files