Adding label (category) tabs to navigation bar

How do you add a tab (on horizontal navigation bar) that shows all the posts that fall under a subject or category in Blogger? Before I give a correct answer, let’s first see a popular-but-wrong DIY method (using Music category as an example): Create a page with “Music” as the title. “Music” tab will be added to the bar automatically. So far so good. Attempt to add music posts to the page.