mplayer is a movie player for Linux and other platforms. It plays most MPEG/VOB, AVI, ASF/WMA/WMV, RM, QT/MOV/MP4, Ogg/OGM, MKV, VIVO, FLI, NuppelVideo, yuv4mpeg, FILM and RoQ files, supported by many native and binary codecs. You can watch Video CD, SVCD, DVD, 3ivx, DivX 3/4/5 and even WMV movies, too.

If you just need to play mp3 in loop use -loop option. It loops movie playback times. Add 0 numbers to play it forever:
mplayer -loop 0 /presentation/foss/bit/08/background.soft.welcome.mp3