What makes the sound of vuvuzelas so annoying?

Der Vuvuzela-Filter: Remove that annoying hum from World Cup games

Vuvuzela inventor cashes in on success at WCup

Final say on vuvuzelas will be given to clubs, say SPL chiefs

Vuvuzela - Open The Magazine

Soccer Players Blame Mistakes On Irritating Vuvuzelas : Show Me

How much does the vuvuzela bother you?

Here are some extremely annoying fans who would make Legend Club

Get your vuvuzela fix: How the wind instrument has invaded popular

Dream Team - The vuvuzela still haunts my nightmares 🎺

Vuvuzela filtering: how-to - AudioNewsRoom - ANR