They started out with a series on YouTube called 'Auto Tune The News' where they would use autotuning technology on a particular news article of the week, often with someone in politics giving a speech and having news anchors from around the country quoting something in particular from the story. Eventually this turned into what they now call Songify This. With millions of views on a number of their videos, they have released some of the songs as singles on iTunes.
For now though, in order of popularity (based on views), here is a selection of hit videos from The Gregory Brothers. Enjoy!
Winning - A Song By Charlie Sheen
Double Rainbow