Not really. The best selling singles of the past sold in millions, they were heard by everyone, people listened to the radio more. That was certainly the case back in the 50s, 60s, 70s, 80s.

So, it still serves the same purpose then doesn't it?
It still charts the most popular music.

Yes, but the music itself is less popular (which I consider significant).

Yea when the Beatles and the stones were big, that's when the charts were good, now it's just auto tuned shiit :L

Whether or not you like the bands on the charts doesn't mean the charts are relevant.

I'll keep saying it, more people liked the music in the charts in the past.

In what sense?

What I said before, record sales and more actually heard the music. Music was less segmented for more people.

What is the difference between the popular music of the past and the music now?

As I said it was less segmented, more listened to the same music. That's the difference in the chart music.