Back in the 79-1980 timeframe, I listened to groups such as AC/DC. Back in Black was a huge album for them. Everyone I knew had a cassette of that album. Of course, it was considered outside of the norm. You know the "pop" songs of the day. It was Rock Music man (had to throw that in there).
Now, fast forward. The other day, I was watching tv and a WalMart commerical was on. Theme music was "Back In Black". So, I guess it is now, 20 years later, mainstream.
Glad I'm not mainstream. And imagine twenty years from now.
Just some thoughts.