Question: It was this day in Rock History in 1980, these guys scored their first UK No.1. It was their first album recorded with their new lead singer. Who was it and what was the album?

Answer: It was the greatest rock band in the world, AC/DC and the album was, of course, Back in Black. The album was dedicated to Bon Scott and has sold an estimated 49 million copies worldwide to date, making it the second highest selling album of all time, and the bestselling hard rock or heavy metal album, as well as the bestselling album ever released by a band.