Here's an example: some popular music tunes are based on classical music, and someone encountering the original for the first time might think "Hey, this is just like that song." Or they might encounter the classical music in a different context than they first heard it, and think "Hey, this sounds just like Looney Tunes."

For specific examples of songs like this, Wikipedia has a list: http://en.wikipedia.org/wiki/List_of_popular_songs_based_on_classical_music and I'm sure there are more.