While calling---as many have---Pet Sounds the "best’ album ever recorded and released is a debatable proclamation---I myself don’t share that sentiment, the album DOES contain the song I consider THE "best" I have ever heard. That song is of course "God Only Knows".
"GOK" contains my single favorite chord progression of all time. It is not only brilliant, but also melancholy enough to bring me to tears every time I listen to it. And Brian Wilson’s employment of the inversion (adding a bass note below the tonic of the chord being played) is as close to J.S. Bach as Pop music gets.
Rick Beato breaks down the song in the following video:
https://youtu.be/HrpxOva8rBQ?si=nO9iHesBKQe2gGK
In the following video, a piano teacher gets even deeper into the weeds in examining the song:
https://youtu.be/PjPN9zRUrgI?si=-5Zg7QhKdndXYPbU

