No substitutions, please

While driving home on a foggy night after visiting some family (well, in all fairness, I wasn't actually driving -- Atticus was, and I was sleepily riding) it was confirmed that no one but Frank Sinatra should bother singing "In the Wee Small Hours of the Morning" and no one but Nat King Cole should ever, ever sing "The Christmas Song" and I'm fairly certain that no one other than Niamh Parsons should sing "The Water is Wide."