streaming Ogg Vorbis/MP3 media server Icecast is an audio broadcasting system. It can stream music in both MPEG 1 Layer 3 (MP3) and Ogg Vorbis formats, supports multiple streams on a single port through the use of "mountpoints," includes web-based status and management interfaces, and has many other advanced features. Many standard audio players can connect and listen to Icecast-hosted streams, since it's based on Nullsoft's Shoutcast protocol and HTTP.