From August of 1967, and the rehearsals for a Hawaiian tour, please enjoy The Beach Boys -- vocals by Brian and Carl Wilson with Bruce Johnston -- and a spine-tinglingly gorgeous version of the Pet Sounds classic "God Only Knows."
And from some time later (I'm not exactly sure when) and a recent MOJO Pet Sounds tribute CD, please enjoy latter-day psychedelic cult figures The Flaming Lips and their characteristically skewed take on the same song.
For what it's worth, I should stipulate here that I have never gotten The Flaming Lips on any level. I don't fault their musicianship, and their hearts are obviously in the right place, but I simply have never been able to figure out what the fuck they're on about. It must be a generation gap kind of thing.