I heard “Echo” by Hardwell featuring Jonathan Mendelsohn recently and really liked it:

I noticed something about it felt very familiar, though, and I was anticipating the notes from the piano before they even came. Then it hit me:

The main melody is reminiscent of a melody in Moby’s “Why Does My Heart Feel So Bad?” It’s much more prominent in this remix from Ferry Korsten:

I don’t know if Moby got it from somewhere else or if that’s his original melody. Interesting to see it in a new song!