Our performance at the Harrogate BABS Convention 2016.

Do you know your key signatures? No? This may help.

(Image: Wikimedia Commons)

What is barbershop singing?

The Wikipedia entry sums it up in some detail.

Here is another way of looking at:

And here's an example. This is the British Barbershop Boys singing their Evolution of Song at the 2011 LABBS contest in Harrogate.