The <bgsound> tag is used to play a sound in a document, in the background. In the example below the song is set to loop forever and have a full default volume. You can set more attributes and values discussed below the example. If no attributes are set by you they will default to normalized central values.
Some other attributes you can use along with "src" and "loop" are:

balance - A number between -10,000 and +10,000 that determines speaker balance distribution.

volume - A number between -10,000 and 0 that will be the volume of the background sound file.