Hmm, I'm not sure I call this more 'adventurous' than TV today - definitely cool. Did 70s TV (in the UK) offer greater variety of programming? Performances of dance (including contemporary dance) have a long history on UK TV.
It’s hard to imagine where you might see something like this today
Ironically, you are more likely to see something like this on YouTube than on TV (I mean not just viewing old TV clips).
Aside: The BBC Archive channel on YouTube is a great dip into some of the BBC archives.