Brian Wilson, an eclectic genius whose sunny Beach Boys songs like "God Only Knows" and "Good Vibrations" helped define American pop music, has died.

Millions around the world are mourning the loss of Brian Wilson, the creative mind behind the Beach Boys’ biggest hits,

John Stamos was by Beach Boys founding member Mike Love's side when news of bandmate Brian Wilson's death on Wednesday was made public. The "Full House" star was also the messenger who delivered the heartbreaking news to Love,

John Stamos said he was the first to tell Mike Love about the death of the Beach Boys singer's cousin and bandmate Brian Wilson: 'His face went blank.'

From "Almost Famous" to "American Graffiti" and "Full House," Brian Wilson and the Beach Boys have soundtracked some of Hollywood's biggest titles.

Brian Wilson’s 1966 masterpiece is now considered a crowning achievement of music. The album’s reputation grew over time.