そういえばMPEG系の音声圧縮は全て非可逆か…。
　MPEG Audio Layer-I (MP1)
　MPEG Audio Layer-II (MP2)
　MPEG Audio Layer-III (MP3)
　MPEG Audio Layer-IV (MP4)
　MPEG Plus (MPP or MP+)
　MusePack (MPC)