Folk Fan: I don't think I can accept your Q1 answer:George Straight sings Noel Leon on Merry Christmas Wherever You Are. I appreciate it coincidentally fits my question, but I am looking for a song recorded by two of the most seminal influences on the Britfolk revival which will rightly occupy the pole position in this quiz. However, your answer does technically fit the question, so congratulations!!
However, your children play in the yard all year long. Mine, or rather the ones in the correct answer, restrict their playing to a much narrower, and more seasonal, time slot.