Then comes "Summer's Gone," which is nearly as fatalistic as its title. It acknowledges Wilson's deceased brothers Dennis (who drowned) and Carl (who died of cancer) with the word "friends," a fitting choice given it's the title of a classic Beach Boys song.
http://en.wikipedia.org/wiki/That's_Why_God_Made_the_Radio
The track "Summer's Gone" was originally meant to be the final song on the final Beach Boys album, according to Brian. The song was written in reflection of his mother's death and the end of Carl's life, who died two months after their mother.
Το συγκεκριμένο τραγούδι μάλλον έχει σχέση με τη απώλεια δικών του ανθρώπων και το τέλος του καλοκαιριού είναι όχημα για να εκφράσει την συναισθηματική του κατάσταση.