 Unlike its predecessor it only lists the chart weeks spent in the top 40 if the single has ever charted high enough during its chart run to do so, while Guinness listed all weeks spent in the top 75.Selected acts have a mini-biography with their entry in the book, while other sections of the book have reports on the charts, such as how they have changed due to the event of digital downloads having an effect.The main section of the book contains the Top 75 UK hit singles, which are separated into the artists; solo singers, duets, groups and bands.