Rockin' around the Christmas tree
At the Christmas party hop.
MIstletoe hung where you can see
Every couple tries to stop.
Rockin' around the Christmas tree
Let the Christmas spirit ring.
Later we'll have some pumpkin pie
And we'll so some carolling.
...Songwriter Johnny Marks....
At the post coordinates, you are looking for a string of numbers preceded by a "B". The "B" is not used in the puzzle.
B- ACDEF-GHJ-KL
The cache can be found at N 42 55.D H (J-G) W 85 42. K (G-H) E
Checksum N .xxx = 8, W .xxx = 10.
Please replace as found.