Gareth Malone returns to South Oxhey to catch up with the choirs he created in 2009.
The choir is challenged to perform at the Royal Albert Hall on Remembrance Sunday.
In Plymouth, Gareth is overwhelmed by eager new recruits for his choir of military wives.
The 2011 fundraising spectacular gets underway, presented by Sir Terry Wogan.
Gareth Malone forms a choir with the partners left behind by troops away in Afghanistan.
Choirmaster Gareth Malone explores the styles and techniques that create a choir.