Ahoy!

Alright, so, in the spirit of conciseness, 2 college students (possibly physics?) get drunk one night and somehow discover that music (maybe tone of voice, or just certain pitches?) Can manipulate the emotions and reactions of others. There was a scene in a train where one of them approached a girl and made her fall in love with him by inserting a series of specific words (or sounds?) In random places in his sentences. The ending scene was an old man on a piano, playing, possibly, Mozart?

It was an English movie, between 2010-2016.

An extremely vague description, but it’s a rather distant memory.

Eternally grateful, if someone recollects the name!