I've been watching "The Story of Top of the Pops" in the 1990s on the BBC over the last few weeks.
It does a good job of highlighting the diversity of music in the UK charts.
All episodes are available here: https://www.bbc.co.uk/programmes/b00704hg/episodes/player?page=1 on the BBC iPlayer. Sign in is required so you'll need to be in the UK or use a VPN.
Or you can find episodes on YouTube: https://www.youtube.com/results?search_query=the+story+of+top+of+the+pops