RSS (most commonly expanded as Really Simple Syndication) is a family of web feed formats used to publish frequently updated works—such as blog entries, news headlines, audio, and video—in a standardized format.
As soon as there is a new article on BassLessons.be, you'll be notified via the RSS reader.

There are many kinds of RSS readers , some free some not, for Linux, Mac en Windows.
Some examples:

• Snarfer (Windows - free)
• Awasu (Windows - free)
• Bloglines (web based - free)
• Google Reader (web based - free)
• Snownews (Linux, Unix - free, via terminal)

Most browser can read RSS feeds too.