The man who invented the Sound of Summer: He was the genius behind The Beach Boys, but his abusive father drove him to years of ruinous drug addiction - until he was saved by the love of his second wife, writes CHRISTOPHER STEVENS ○

From his brutal childhood - beaten so badly by his monstrous father that he was deaf in one ear - to his decades of paranoid, drug-addled seclusion, he fought a constant battle against the world.