Name: Vorbis
       Status: Windows(Y), Linux(Y)
        Level: Beginners
   Maintainer: Core developers
      Summary: Ogg Vorbis music (free alternative to mp3)

From http://www.xiph.org/ogg/vorbis/index.html:
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Ogg Vorbis is a fully Open, non-proprietary, patent-and-royalty-free,
general-purpose compressed audio format for high quality
(44.1-48.0kHz, 16+ bit, polyphonic) audio and music at fixed and
variable bitrates from 16 to 128 kbps/channel. This places
Vorbis in the same class as audio representations including
MPEG-1 audio layer 3, MPEG-4 audio (AAC and TwinVQ), and PAC.
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This example demonstrates the use of ClanVorbis to play .ogg files.

You should hear a crowd cheering/whistling when running this example.