I have to admit, Adele's album '21' is downright incredible. I've been listening to it almost constantly for over 6 months. There's not a bad song on the album. As a matter of fact, it's dang near perfect. The standout hit is 'Rolling in the Deep' which you can hear below if you don't know it.

Anyway, someone took 71 different covers of 'Rolling in the Deep' and edited together clips from each of them so the finished product is the whole song.

The only problem is, whoever did it didn't seem to care what KEY people were singing in. There's an instrumental version of the song playing in the background the whole time, but for a solid minute, the singing doesn't match up.

The worst out-of-key clips start at 1:21

And here's the original: