In Mexican tradition, November 1st is the central point in the Days of the Dead (October 31st through November 2nd), while in older Christian tradition it’s All Saints’ (or, as many would have it, Saints) Day. For some of us, there is specific music for the day: the magnificent processional hymn “For All the Saints”, sung to the Ralph Vaughan Williams tune Sine Nomine.
(#1) Fra Angelico, The Forerunners of Christ with Saints and Martyrs (from the 1420s, tempera on poplar wood) (from Wikipedia)