www.dailymail.co.uk/sciencetech/article-8706711/Singing-Happy-Birthday-spread-Covid-19-new-study-warns.html
To understand how many virus particles are emitted when we sing, researchers had 12 healthy singers and two people with Covid-19 sing into a funnel.
The study shows that singing – particularly loud and consonant-rich singing found in songs like Happy Birthday – spreads a lot droplets into the surrounding air.
Researchers say if singers wear a face mask and venues practice social distancing and implement good ventilation, then the risk from singing can be reduced.