So what is it that makes some choirs better than others? What should they wear? And is it healthy for choirs to compete against each other?
We asked some of the foremost singers, music stars, celebrity choir fans and experts what they think about singing in a choir, what their 'pet hates' are, and the 'do's and don'ts' of performing as a group.
Is there a difference in opinion between those who sing professionally, and those who sing purely for pleasure? We spoke to X Factor / G4 star Jonathan Ansell, Stephen and Dominic from Blake, New Zealand singer Hayley Westenra, acclaimed choral director Mike Brewer, Blue Peter presenter and choir singer Zoe Salmon, EastEnders star and ex-singer John Partridge and Last Choir Standing's very own Sharon D. Clarke. Click 'more answers' after each question to find out what they all had to say.
And we want you to join in the debate. You can post your thoughts using the comments form on each answer page and we'll publish the best ones.

Sharon D. Clarke: "Firstly how do they sound? Are they together, do they blend? Are they listening to each other? Tuning - do they make my ears hurt? Am I wincing and going "ouch"? That's not a good sign!"

Mike Brewer: "It's well-being, self confidence and flowering as a person in every sense."

Jonathan Ansell: "Yes! There should be some kind of marked deduction for bad clothes or costume."

Dominic Tighe: "No, not really... perhaps something by the Prodigy isn't really appropriate for a choir?! We'd do a great cover of a Prodigy song though!"

Hayley Westenra: "Definitely, yeah! I think music's a great thing to have, it's a very natural thing to sing and it should be encouraged."

John Partridge: "The great thing about a choir is that they are great at building confidence. The fact that you're all singing together, it doesn't really matter if you're not the best singer in the world, as a great choir is about blend."

Sharon D. Clarke: "I love it when they move! Music is supposed to come from within your body; it's supposed to make you move. So anyone who sings standing still, for me, is not working. I want to see something."

Stephen Bowman: "Yes absolutely. Choir competitions aren't anything new; this programme just makes them a little more glamorous! It's a great way to push people."

Zoe Salmon: "They're all so entertaining, they really are. They're so charismatic and they're just a little choir unto themselves really!"

Jonathan Ansell: "Hmm - that's a difficult question! I think a choir needs to be, in my eyes, at least 10. Otherwise it's a vocal ensemble I guess. From 10 upwards the sky's the limit really!"
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