Christine accepts her place on Doctor Corby’s research fellowship and breaks up with Spock in a jazzy number in the crowded Enterprise bar. Later, a hurt Spock vows to return to a more Vulcan philosophy, in a moodier, 80s synthpop-tinged number, performed in Engineering, which acts as a reprise to Christine’s.
Lieutenant La’an Noonien-Singh’s issues with the improbability field play a big part in the episode, as she continues to carry the weight of her experience with an alternate timeline version of James Kirk from earlier in the season. Following a dramatic power-ballad in which she wrestles with the desire to take more chances and be more emotionally open with others, La’an ultimately chooses to tell the prime universe version of James about her feelings on her own terms, without the field forcing them out in a song.
Ensign Uhura’s role in this episode ends up being vital to the resolution. Her solo in Engineering highlights how her position as communications officer has given her a new sense of purpose, as well as new friendships that have strengthened her (like her late mentor, Lieutenant Hemmer). It is Uhura who determines that the improbability field can be shattered if it were to come into contact with the energy produced by an epic grand-finale number. With that in mind, Uhura inspires the entire Enterprise crew to join together in a power-pop showstopper to successfully neutralise the field (with unintentional help from the Klingons, in a hilarious and baffling homage to rapper and singer T-Pain).
Music has been crucial to how I see the world and relate to people since I was 6 years old, singing the latest hits in an isolated corner of the playground at school. One of the great things about music is that it can also help you to learn new things about yourself and allow you to share them with the world. In ‘Subspace Rhapsody’, the music may have threatened to drive the crew of the Enterprise apart but, ultimately, it gave them the opportunity to celebrate their unity and reaffirm their belief in their mission of exploration, just as this episode allowed Star Trek to reaffirm its commitment to telling new kinds of stories. If Uhura humming to herself in the final scene means anything, it hopefully won’t be the last time that music plays a part in the future of Trek.