0_Apprentice
I love rock and roll music.  Do you know much about the genre?
1_Wizard
It's a genre of popular music that came about in the United States around the late 40s/early 50s, from African American musical styles, like gospel, jump blues, jazz, boggie woogie, and with some country music thrown into the mix!
0_Apprentice
So it has a lot of influences.  When was rock music the most popular?
1_Wizard
Perhaps in the 1950s and mid 1960s, as this was the time when the "more encompassing international style" of rock music came about
0_Apprentice
Is rock and roll still popular today?  
1_Wizard
It's hard to say. However, radio stations have much success playing classic rock and roll, which is a sub genre that usually has one or two electric guitars, a double bass or string bass or electric bass guitar, and a drum kit.
0_Apprentice
I used to listen to the rock band Rolling Stones.  Are they still around today?
1_Wizard
They are! Even though they were formed in 1962 and have had a long list of line-up changes, they're still around today, with Mick Jagger still leading the band.
0_Apprentice
Wow, that is a long time to be playing music.  I wonder if any other bands have been around that long.
1_Wizard
It all depends! You have bands like the Red Hot Chili Peppers who, although have not reached the popularity of the Rolling Stones, have been around since 1983 themselves. Many bands reach a legacy and are able to continue playing for decades