If I had to give a list, I'd give one thing from each of the major times (baroque, classical, romantic (early, late), early 20th, late 20th. Leave out the 20th

If I had to give a list, I'd give one thing from each of the major times (baroque, classical, romantic (early, late), early 20th, late 20th. Leave out the 20thC atonal stuff. Focus on "lively things" (think: does it have a beat). I'd also avoid the warhorses, so that it's not "I guess I'm supposed to like this". Then based on feedback, drill down. (This is assuming that it's a guided tour.)