HiLo, this page (click) lists the names of the 16 people executed after the 1916 Easter Rising. I think the two best-known names are Joseph Mary Plunkett and James Connolly. We have songs about Plunkett (click), and about James Connolly. I'm sure we have a number of songs about the Easter Rising, but we don't have them grouped together. See also The 1916 Song Project, which has participants whose names may be familiar to many of us.
-Joe-