But anyway, this article could have gone on much longer, especially if it didn't limit its scope to cross-genre covers. When A Perfect Circle covered Lennon's "Imagine," well, both artists fall under the Rock umbrella, but it's hard to imagine a cover that so completely departs from the original. Whereas Lennon sings a hopeful recipe for peace, love and happiness, Maynard Keenan inverts all the hope and optimism of both the lyrics and melody, making the song a bitter, sarcastic dirge. Don't listen on a cloudy day.