Dr. Charles Knowles, a Surgery Professor at Queen Mary University, London, published this song on Youtube. It is a song penned to support NHS and other key workers fighting the COVID pandemic. A recording phone voice memo of the doctor and his guitar at home with pictures of those who have lost their lives by helping others is more than enough to thrill each one of us. 

All the support and courage to all the heroes fighting, and soon "all the things that made us smile will make us smile again". Thanks for this tribute, dr. Knowles!