The song, written by Luc Floreani, will be released on Monday to mark the start of the charity’s annual Action Week on homelessness.
St Mungo’s Broadway provides a bed and support to more than 2,500 people a night who are either homeless or at risk, and works to prevent homelessness, helping about 25,000 people a year.
Blake – Stephen Bowman, Humphrey Berney and Ollie Baines – are currently touring the UK and overseas, including their first major tour in South Africa in June.
To find out more about St Mungo’s Broadway, click here.