I am trying to display the number of posts that have been tagged by a certain tag.
For example, If I have 20 posts that are tagged with the tag “music”. I would like to be able to call something so that it would show (20) and update as I tag more posts with the “music” tag.
That function only applies to tags attached to a specific post I think.
I was thinking you might be able to use this: http://codex.wordpress.org/Template_Tags/wp_tag_cloud - and choose ‘format’ => ‘list’ - that will give you a list of tags used sitewide, and you can order them by count, but it doesn’t seem to be able to output the count.