It's a feat that only a few acts have managed in the chart's 60-year history.

Not just singing, but writing! We look at popstars who turned author.

Who is Sgt Pepper? Which are the album's most popular tracks? 50 years on, The Beatles' eighth album is still a pop cultural landmark.

Does that voice sound familiar? Unknown or uncredited guest appearances on big hits.

We take a look back at who was topping the Official Singles Chart and Official Albums Chart this week in chart history.