Christmas songs for seniors?
General mountain dulcimer or music discussions
I Saw Three Ships Come Sailing In (quite easy and very lively)
O Come Little Children, O Come One and All (they may remember singing this when they were children)
Good King Wenceslas (A good steady rhythm that works well with bells and shakers)
Go Tell it On the Mountain
Hark the Herald Angels Sing
What Child is This
O Christmas Tree
Angels From the Realms of Glory
Ding Dong Merrily on High
We Three Kings
There's a Song in the Air
We Wish You a Merry Christmas! (Good one to end on)
If there's anyone who can sing a familiar tune in a foreign language, that's always nice--but keep it short!
Also, what's familiar to one person may be totally unknown to someone else the same age living in the same city. But keep in mind, too, that the Christmas hymns sung in church in the 1930's through the 1950's might not be the ones sung today, so I'd look for some old hymnals and see what they include. Also, folks who would be clueless about "Holly Jolly Christmas" might be able to belt out "There's a Voice in the Wilderness Crying!" because they always sang that during Advent!
Anyway, I'm sure that whichever songs you choose, it will be great!