MPEG Audio Layer II
From Just Solve the File Format Problem
MPEG Audio Layer II, also known as MP2 (but not to be confused with MPEG-2), is a compressed audio format. There are two versions of it: MPEG-1 Audio Layer II and MPEG-2 Audio Layer II.
- ISO/IEC 11172-3:1993 - MPEG-1 Part 3 (not free to download)
- ISO/IEC 13818-3:1998 - MPEG-2 Part 3 (not free to download)