New melodies arise as Rodrigo & Hailey take their relationship public. Hailey struggles to prove herself as a conductor, while Rodrigo fights to keep his inspiration alive. Thomas joins a start-up orchestra in Queens that challenges Gloria.
As Rodrigo and Hailey navigate the status of their new relationship. She gives her Ensemble a fresh direction. Thomas steals Gloria away from work for some afternoon romance. And a world-renowned choreographer (John Cameron Mitchell) invites Rodrigo to collaborate on a new ballet.
Hailey returns home to North Carolina to teach a master class at her high school and finds her parents have some surprising news. Gloria gloats about a very important guest set to visit the NY Symphony and Thomas gets a visit from a fan with an intriguing offer.
After a disastrous night at the NY Symphony, Gloria finds herself in a PR whirlwind, having to re-secure a major donor. Rodrigo becomes fascinated with the ballet, while Hailey tries to make some professional connections without his help.
On a mission to talk to Mozart, Rodrigo visits an unusual classical music collector (Michael Emerson) who might have what he needs. Hailey gets an exciting conducting opportunity, but has to prove she is up for the challenge. Thomas discovers the missing ingredient for the Queens Phil and invites Cynthia along for the ride.
Rodrigo distracts himself from the Requiem as he dives deeper into coaching Hailey for her big gig. Gloria gets a visit from a famous composer, eager to premiere his latest piece with the NY Symphony, but Thomas thinks his knows of a better fit. Despite doctor's orders, Cynthia returns to playing with renewed vigor.
Hailey faces off against new peers at the Fukusoft Conducting Competition in Japan. Rodrigo meets a new composer who claims to know more about Mozart than he does. Gloria tries to eclipse Betty in her fight for Fukumoto's attention, and Thomas is reluctantly reunited with an old flame.
Rodrigo's calls out for Mozart. The conducting competition heats up for Hailey, despite her early success. In their toughest moments, they reach out for each other. Meanwhile, Gloria and Thomas finally have it out over the secrets they've been keeping.
Before saying goodbye to Japan, Rodrigo and Hailey experience a tea ceremony.
Rodrigo and Hailey return home to find their lives changed. Meanwhile, Gloria and Thomas are back too, but it's business as usual with them as the showdown over Hesby's piece intensifies.
The premiere Hesby's new piece doesn't go exactly as planned. Hailey recommits herself to the music. Cynthia finds solace in her new endeavors. Rodrigo must make a choice about his role in the orchestra.
Hailey and Rodrigo's romance deepens as they go public with their relationship in the fourth season of the Emmy and Golden Globe winning series. As Rodrigo learns what it means to be a boyfriend, Hailey enters a competition in Japan to prove herself as a conductor. Will they be able to balance the demands between their careers and relationship or will it tear them apart?