Kidderminster Male Choir performs at HMP Birmingham
A Worcestershire male voice choir was due to perform in a Birmingham prison to help interest inmates in singing.
Kidderminster Male Choir was asked to sing at HMP Birmingham following an invitation from a senior jail manager.
A member of the group, Paul Booton, admitted he was nervous but would treat it as "any other concert".
The 70-strong choir, which is a registered charity, was also raising money for the Queen Elizabeth Hospital in Birmingham.
Mr Booton said: "We practise a couple of times a week and we just take it as a normal concert whether it's in the local town hall or wherever it is.
"Apparently they're trying to motivate the prisoners to set up their own choir."
HMP Birmingham, known as Winson Green Prison, was the first existing public sector prison in the UK to be transferred to the private sector when G4S took over the running of it from the government.