Another way to think about this is to ask yourself what your favorite music artist are from the time period of 1850-1925. Can you even name a music artist from the 1850-1925 time period? It was a time of no radio and TV, and very little in the way of recorded music. The purchase of sheet music determined who the most popular music artist of the era were.
It?s difficult to answer this question precisely because we can?t look to the past to answer it.
The modern era of recordings, celebrity, and this level of shared national/English language world/international culture is all recent.
We seem to consistently start the clock in the late 60s, Elvis aside. And I agree Elvis as a celebrity figure - his looks, hair, dancing, and snippets of his voice including speaking voice - have already overshadowed his song recordings (and I don?t know if he even wrote any music).
It could go one of two ways, I think.
Either only The Beatles music is remembered in 100 years, and new generations stop discovering or caring about Chuck Berry, The Rolling Stones, Prince, and all the rest.
Or, pretty much everyone who has already stood the test of time will continue to do so as coming generations include a subsegment who seek out past culture (music, film, shows).
Why would that be different now? Mainly due to quality of recording. Really old recordings sound/look bad. Music and film production came up to a level we can appreciate today sometime in the late 60s and early 70s.
Kids today are better able to appreciate Dark Side of the Moon or Rocky Horror Picture Show better than folks our age could appreciate the equivilent works of the 1940s.
There are a few things from that era that still remained when we were young, but fewer than the stuff from the 70s that remain today.