What makes soundtracks and music scores tug at our heartstrings?

When music in movies and TV drama series is played exceptionally well, it has the ability to latch onto our nostalgic heartstrings. We go down our playlists of timeless favorites and try to answer this question: do recent music scores and soundtracks hold up to the same standard as their predecessors? On the show: Heyang, Xingyu & Josh Cotterill