Use the EMBED command to embed a sound file and have it play in the background. Upload the sound file to your server as raw data and include the following tag in your HTML document:
AUTOSTART=FALSE LOOP=FALSE WIDTH=144HEIGHT=74 CONTROLS=CONSOLE>
Just click on the arrow button in the middle of the console below to hear hal.wav:
Sound files can be uploaded and played in WAV, AIFF, AU, and MIDI format. In addition, you can use the EMBED tag to play QuickTime movies, AVI and VRML files.