Incidentally, until I looked it up, I had no idea that Mariah Carey had written All I Want For Christmas Is You. Maybe that's partly because I've never paid any attention to Mariah Carey ever at all, but it also speaks to the fact that the song feels old, it feels like a standard from decades ago. Even The New Yorker thinks so: Sasha Frere-Jones called it "one of the few worthy modern additions to the holiday canon".
I think the only version of it that I have is a charming and perky cover by the Puppini Sisters - and I do have a lot of Christmas music.
Part of my Christmas music obsession is that I really like listening to covers, versions of things I know well. When you listen to 47 different versions of a really simple song like Silent Night, you really start to hear what's going on. Lyrics morph, rhythms shift, tempos change. Poking around the 'tubes today, I found a site that may lead to a complete and utter trip down the rabbit hole. Called Who Sampled, it's a "site for discovering and discussing sampled music, remixes and cover songs...about the discovery of new and old music, the exploration of musical influences and the sharing of knowledge". Plug in a song, and get a list with a whole mess of other versions. Click through to one of them, and you get a page with YouTube links of cover and original side by side.
Who Sampled lists twenty four covers of All I Want For Christmas Is You. Most of them are probably execrable, maudlin twaddle, but twenty four! A person could really get lost.
Tell me, what song are you going to look up?