Normally I always hear that they ask the typical question: what is your favorite song?
Many people usually say a song considered their favorite because it brings back memories or they just like it.
Because simply a song replaces one that is to say there is a point that a certain "favorite" song bores of so much listening and repeating it at all times and in certain cases even irritating it becomes. Until a new song arrives which we like more and another cycle begins until we are boring songs and listening to other new songs that we like.
Personally I think the question would be, what is your favorite current song ?.