That's when they join forces with BBC Radio Nottingham for joint 40th birthday celebration as they share the platform at Nottingham's Royal Concert Hall.

Fans of both organisations will be able to see video clips of past exciting times in the history of Cantamus and memorable events in Nottinghamshire's past, as well as getting a feast of music and interviews with surprise guests will give the audience a never-to-be-forgotten experience.

More than 80 of the ex-members of Cantamus will be there that night – but they will not just sit reminiscing.

For the finale they will join the present two choirs on stage in a medley of songs, each one popular in its decade arranged by Michael Neaum, its former accompanist. Many of the 'girls' are now professional singers — some in opera — so the roof needs to be well insured!

Presenting the night to remember will be Mansfield's Richard Bacon, who will also be interviewing surprise guests.

There will be too many stories in the choir's history to pull in on one night, but producer Graham Owens will see that much is covered, along with many of the highlights of BBC Radio Nottingham's reporting over the years of events that made the headlines in the last 40 years.

Personalities who featured prominently in both organisations' development will either be there in person or on the screen.

Scenes from some of the many international competitions the choir has won will be shown — especially the triumph in China where the playing of the national anthem as Pamela Cook collected the championship award had everyone in tears.

Cantamus started in 1968 in the front room of singing teacher Pamela Cook when she brought together a few of her pupils to enjoy making music together.

Unfortunately, it will be impossible on this occasion to be able to depict all the successes of the subsequent years.

However, travels to Japan, China, Israel, USA and Canada, as well as many countries in both East and West Europe, will be covered – and all the members will be sure to be thinking of the many wonderful concerts in top concert halls and stately homes in Britain and overseas with eminent artists the choir has experienced.

The last performance by the current Cantamus members, in July, was in the London Proms in the Royal Albert Hall with the BBC National Orchestra of Wales — perhaps the most prestigious highlight of the choir's career.

Pamela Cook is still the choir's director after a lifetime of achievement which has been rewarded with an MBE and various awards from august bodies such as the Birmingham Conservatoire, Royal Academy of Music, International Rotary, and the Association of British Choral Directors.

She has inspired girls from all types of backgrounds to fulfil their dreams either in singing, teaching or in other careers, helped by the team who were trained by her — Ann Irons (who conducts the Training Choir), Elaine Guy and Joy Nicol.

A donation from the proceeds of the Royal Concert Hall event will be made to the BBC Children in Need appeal and it's hoped that Pudsey will be somewhere around!

Tickets in the 2nd Tier are still available either from the Royal Centre Box Office or Sheila Haslam, Cantamus's secretary on 01623-627764.

There are not any seats available for the Mansfield celebration concert at Mansfield Palace Theatre on Sunday 16th November.