Bono, The Swell Season’s Glen Hansard, Damien Rice and Mundy collaborated on Christmas Eve. The Irishmen united for an impromptu busking session on Dublin’s famed Grafton Street. The gig raised money for Simon Community, an organization which serves Ireland’s homeless population. The hour-long set featured a number of covers, including Bob Dylan’s “Knockin’ on Heaven’s Door,” Ben E. King’s “Stand By Me” and Mic Christopher’s “Heyday.”