Musica is one of the triplet sirens—alongside Musiere and Muselle—whose music inspires the ancestral Zor people of planet Glorie. The Zor returned to reclaim their world from human colonists, with the triplets serving as cultural figures bolstering their society through performance.

Her character development stems from growing doubts about the Zor mission, sparked by her encounter with Bowie Emerson, a human soldier and pacifist. This relationship leads her to question her people's actions, culminating in her defection from the Zor mother ship to Glorie. Her departure strains her bond with Musiere and Muselle, particularly as she realizes the pain it causes them.

Emotionally expressive, Musica experiences intense reactions to her conflicting loyalties and feelings for Bowie. Overwhelmed by the internal conflict between duty and her newfound attachments, she faints when ordered to deny her emotions. After defecting, she and Bowie flee into Glorie's wilderness to evade capture by military forces.

Her narrative arc intersects with the broader conflict through her relationship with Bowie and her status as a defector, positioning her as a symbol of potential understanding between humans and Zor.