By his own omission, Steve Lukather is an open book. “I’m painfully honest,” he says when we start our conversation. “Be careful.” But there isn’t any need to proceed with caution. Lukather has a story for just about anything — often with a laugh or self-deprecating quip — whether it’s the thousands of songs he’s played on as a session guitarist or the exploits of his yacht-rock brothers, Toto. Lukather’s band has blessed the rains...