Mariah Carey’s “All I Want For Christmas is You” is a classic. It’s one of those songs that everyone knows 99% of the words to, not because you love it, but rather, you know them because of the song’s incredible ubiquity over the holidays.

Last night, Mariah performed during the Tree Lighting Ceremony at Rockefeller Center, and much to the dismay of… well, everyone who saw her performance, live or otherwise, she didn’t sound like her vocally limber self.

Isolated and unedited vocals from the performance leaked, and they are terribly and amazingly awkward. Of course, it could have been due to technical difficulties (as her tweet post-performance suggests), or perhaps Mariah was under the weather—we just don’t know. Regardless, it’s worth the watch.

(The Concourse / TMZ)