List of albums that will still be popular 50 years from now...

Rich, classical music is no contest. Will survive another 500 years.
Inna, forget the old music and emerge new please.

“Disco Baby” by Van McCoy and the Soul City Symphony.

Fo’Shizzle.

I'll bet on:

Chuck Berry as the moving force in delivering a "race music" soundtrack for the counterculture of the 1960s and Elvis and The Beatles (very possibly Brian Wilson, too) as the moving forces in co-opting that back for mainstream Western culture and commerce.

The social context of rock n roll is important and my guess is that the r n r music that survives the longest will be that which played a pivotal cultural role, per the above.

Some of the Brill Building music (Carol King Tapestry, etc) may survive, too - but that's a different (not r n r) kettle of fish, IMO.

Czarivey, it's a long process, it takes time. But I am on my way, I gradually stop listening most of what I have been listening.
In 500 years it is possible that humans will change quite dramatically, perhaps becoming sort of enhanced humanoids or something else, and music as we know it will be irrelevant.
But in the near future Western and Middle Eastern classical music should survive.

Indian classical music too.