George Young, the decades-long music man known for producing his brothers in AC/DC, has died at 70. The death of Young, born in Scotland but a longtime Australian who also led the 1960s group the Easybeats, was announced by record company Albert’s on Monday. “A consummate songwriter, trailblazing producer, artist, mentor and extraordinary musician, George was above all else a gentleman who was unfailingly modest, charming, intelligent and loyal; a man with a wonderful sense of humour,” it said in a statement. …