Have you heard of Mick Jagger? For their first stable line-up, he was the lead vocals.
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.
I love rock and roll music.  Do you know much about the genre? 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! So it has a lot of influences.  When was rock music the most popular? I'm unable to say but around the mid-1960s was when it turns to "the more encompassing international style" of rock music Is rock and roll still popular today? It's hard to say, have you heard of classic rock and roll though? It's played with 1 or 2 electric guitars, string or double bass or electric bass (after mid 1950s) and a drum kit. I think I have but more of the musicians than the genre itself. I think Rolling Stones might be one but I'm not sure who's part of the band.
The first stable line-up consisted of Brian Jones (guitar, harmonica), Mick Jagger (lead vocals), Keith Richards (guitar, backing vocals), Bill Wyman (bass), Charlie Watts (drums), and Ian Stewart (piano).