Bono and the Irish musician shared vocals on streets to help raise money for The Simon Community which supports and campaigns for homeless people.
Wearing black casual outfit and his signature aviator glasses, Bono performed some songs like "O Come, All Ye Faithful" and "I Wish It Could Be Christmas Everyday". He was surrounded by people who later sang along to the tracks.
Bono and Glen have been serenading fans on Dublin's Grafton Street for five years now. The efforts helped raise money for homeless people, reported Aceshowbiz.