I hated all the chords for Drummer Boy that I found online so here we go:
G Am Em Come they told me, pa rum pum pum pum A new born King to see, pa rum pum pum pum D G Am F Our finest gifts we bring, pa rum pum pum pum D G F Am To lay before the King, pa rum pum pum pum, Em F rum pum pum pum, rum pum pum pum, G Am Em - F So to honor Him, pa rum pum pum pum, G When we come.