1. AAC

Advanced Audio Coding, an MPEG standard and successor to MP3

2. DAPs

Digital Audio Players, more commonly known as MP3 Players. Refers to any kind of portable audio playback device.

3. LAME

LAME Ain't an MP3 Encoder, a free, open-source MP3 encoder offering the best quality MP3 encoding

4. MP3

MPEG-1 Audio Layer 3, a popular audio compression format

5. transparent

When used to describe an audio format, refers to near-CD quality audio that is almost indistinguishable from the original.

6. WMA

Windows Media Audio, a proprietory format developed by Microsoft