Falling in Love is just... these chords
This is the song that I am currently swooning over. Appropriately it's titled Falling in Love, from the musical Forbidden City. Particularly striking is the chord progression from a chord I to the third inversion of a chord II7, as exemplified by measures 1 and 3: C --> D/C. It's one of my favourite chord progressions. Other pieces of music that use this include Theme from Earth Day, Elton John's The One, the Cats Overture and the Pomp and Circumstance March No. 1, just to name a few.
*This score was notated through listening the recording.