I think it started dying around the Sgt. Pepper time period when these guys all started thinking they were “artists.” But, for me, the mid-90s was about it so give rock a 40-year run.
I read somewhere that Led Zeppelin still sells 3 million records a year.
I think their last album was Coda, back in '80 ish. Zep died with Bonham, but Page and Plant were great in Un Ledded about ten years ago