mad123 is a simple command line MP3 player using Robert Leslie's libmad fixed-point MP3 decoder library. This is not meant to be a serious replacement for the ubiquitous mpg123 program. Instead, this is a merely an experiment in using libmad. At the time mad123 was written, a couple of things set it apart from the command line MP3 player supplied with libmad (madplay): 1) Supports URL style MP3 pathnames. 2) The audio output is double-buffered. Multiple audio backends such as Sun (OSS), aRts, and pcm are supported. 3) Streams can be pre-buffered using read-ahead. 4) Simple keyboard controls. 5) Playlist support. 6) CTRL-C behaves like it does for mpg123. 7) It can be installed setuid-root so it can adjust scheduling priority to reduce its susceptibility to jitter.