| Filename extension | .mp1 |
|---|---|
| Internet media type | audio/mpeg, audio/MPA |
| Initial release | December 6, 1991 |
| Latest release | ISO/IEC 13818-3:1998 (April 1998) |
| Type of format | Lossy audio |
MPEG-1 Audio Layer I (MP1), is a lossy data compression format for audio. It is a deliberately simplified version of the MP2 file, but both formats have been largely made obsolete in favour of the more popular and higher quality MP3. Its most notable use was on the Digital Compact Cassette.