harmonist

/ˈhɑrmənɪst/
noun
  1. A person who plays or sings in harmony with others, especially in a musical group.
    • The choir director asked each harmonist to focus on blending their voice with the section.
    • As a skilled harmonist, she could easily find the perfect vocal part to complement the lead singer.
    • The band's harmonist added rich layers to the folk song during the chorus.
  2. A person who brings agreement or reconciliation between conflicting parties or ideas.
    • The diplomat was known as a harmonist who could ease tensions between rival nations.
    • In the tense meeting, she acted as a harmonist, helping both sides find common ground.
    • A good team leader is often a harmonist, smoothing over disagreements among coworkers.