Faith communities are being invited to take part in a study of the role singing plays in spreading coronavirus.
Participants will be asked to sing at different volumes, and lasers will be used to detect and measure the droplets they produce.
Researchers will then look into how many droplets are blocked by different types of face covering.
The hope is this can inform guidance to allow worshippers to return to communal singing safely.
The team will also collect information about how Covid-19 has affected the experiences of prayer for different faith groups.
Prof Laurence Lovat, professor of gastroenterology and biophotonics at University College London (UCL), is asking participants to complete a questionnaire on how their practice of worship has changed during the pandemic.
They will be