[marcus_holmes]

I'm not sure I agree with this definition - I was a teenager in the 80's when radio dominated the music industry, and they played a lot of stuff that wasn't "pop music".

John Peel's show on Radio 1 in the UK was practically the definition of counter-culture music at the time, yet that was the mainstream music radio station.

[multjoy]

But the rest of the Radio 1 scheduling was very pop. Being a national broadcaster it has to consider the non-mainstream.