The vuvuzela is rapidly becoming the soundtrack to the 2010 football World Cup.
Local fans say the metre-long honking plastic horn is part of South African football-supporting tradition.
Critics are less kind, comparing the noise to the drone of a thousand bees, or the sound of a goat being dragged to slaughter.
Players have complained they make it hard to concentrate on the pitch.
However, World Cup organisers have said they will not ban vuvuzelas from stadiums.
Steve Haynes is a musician and vuvuzela teacher in London and Thabiso Tema is a South African broadcaster.
First broadcast 13 June 2010
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