Sounds in HTML and two very useful tags.

Sounds

There are two ways to insert sounds in your web page. The first way uses tag <bgsound>. This tag has parameter src that indicates what sound file you want to play. If you have that parameter set the specified music file starts to play when the page is loaded. Example of usage can be found in this file.

This tag has an interesting feature. It can be inserted in a page without any source file specified. Source files can be specified later by JavaScripts. Once a source file assigned to the parameter src of the tag bgsound it will be immediately played by the browser. This option can be used to insert sounds generated by some events. This file gives an example of such usage.

Another way of inserting music to your web page offers tag <embed>. Parameter src of this tag works similar to the tag bgsound specifying the music file to play. Unlike , tag bgsound this file doesn't start to play automatically (by default). This tag displays a music console that allows users to stop/start the music and change its volume. Additional parameters of the tag embed are:

Here you can find an example.

Tags <div> and <span>

Tag span is an inline tag-container that can have some text in it. This tag is very convenient when you need to specify some properties of this text and can not include it in any other tag. Here is an example:
Code Result 
This is some usual text. <span>And this is some text inside a 
<kbd>span</kbd> tag </span>. This is continuation of the 
usual text.
 This is some usual text. And this is some text inside a span tag. This is continuation of the usual text.

Tag div is a block-level container. That is, everything it contains will be separated from other text by new lines: 
This is some usual text. <div>And this is some text inside a 
<kbd>div</kbd> tag </div>. This is continuation of the 
usual text.
Code Result
This is some usual text.
And this is some text inside a div tag.
This is continuation of the usual text.

I realize that these tags may look a little strange and confusing, but you'll understand their usefulness better when we learn Cascading Style Sheets.