An 50+ age group lady walk in, she made an inquiry about piano learning, I said can. She said she want to popular song, I said can, I ask her what kind of popular song she wanna learn? The popular song of nowadays or my age of popular song or her age popular song. Definitely her age of popular song, for sure ,her popular songs are an oldies from the sight of youngster.
Popular, oldies, classical, is depend, from what age you refer to.