W3Schools.com have had many information about standard of W3C.
Especially It announced HTML5 tutorials. It's very useful for me.
http://www.w3schools.com/html5/default.asp
Some blogs have a background music such as BGM.
Most of all are used windows media player in Internet Explorer.
This sample used <audio> tag of HTML5.
I set auto play and hided controls. Maybe you can listen to music in this post.
Of course, It can be played in a browser that support <audio> tag of HTML5.
Under Internet Explorer 8, you saw just some text.
The source is as follows.
In the below source it is set control and repeat.
<audio autoplay="autoplay" loop="loop" controls="controls">
<source src="rain.mp3" type="audio/mpeg" />
<source src="rain.ogg" type="audio/ogg" />
</audio>
I tested at mobile environment.
Android is a fully working auto play.
Though iPhone support HTML5, it is not working auto play.
Only when the user clicks, the music is playing.