Listen to Wikipedia’s recent changes feed. The sounds indicate addition to (bells) or subtraction from (strings) a Wikipedia articles, and the pitch changes according to the size of the edit. Green circles show edits from unregistered contributors, and purple circles mark edits performed by automated bots. You may see announcements for new users as they join the site — you can welcome him or her by adding a note on their talk page.
Ein recht entspannendes Gebimmel.