Rebecca Black - Friday - The worst pop song ever?

The honour undoubtedly goes to Rihanna's "Umbrella", but you decide.

A song by a 13-year-old American teenager has gone viral on the internet after being widely described as the worst one ever recorded.

Rebecca Black's pop song called Friday has been viewed on YouTube more than 29 million times.

It has trended on Twitter and been the subject of huge online comment and discussion.

Mainly because it's been derided by millions of people for what they say are its awful lyrics.

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