The first of Madonna's 13 UK number one singles came this week in 1985.

25 years ago exactly, she was on top of the charts with Into The Groove.

So, on tonight's High School Days, more of those artists who are no stranger to being at number one...

But their first time there was back in the 80s.

And we're testing your knowledge of them here too with our fun HSD Homework. Good luck!