The latest from the Church of England:
The Government has advised that:
Where singing or chanting is essential to an act of worship, this should be limited to one person wherever possible. Exceptionally, where it is essential to the service, up to three individuals should be permitted to do so. Strict social distancing should be observed and the use of Plexi-glass screens should be considered to protect worshippers, and each other.
Communal (congregational) singing should not take place. This applies even if social distancing is being observed or face coverings are used, indoors and outdoors.
It has been confirmed that this guidance applies both to professional and amateur choirs where a congregation is present.
Under the Performing Arts guidance professional groups may continue to rehearse and train, and perform for broadcast or recording purposes if a congregation is not present. In such cases the numbers or people involved should be kept as small as possible to minimise risks and participants should follow social distancing guidance.