Duet/duˈet/ Definition 1 of 3Pro Tip 1/3Music Genres Duets can be part of any music genre, from classical to pop. The opera featured a powerful duet in the final act. Pro Tip 2/3Not Always Vocal Duets aren't limited to singing; they can be instrumental. Their guitar duet captivated the audience. Pro Tip 3/3Harmony Importance In duets, harmonizing the performers' sounds is crucial for a good performance. They carefully rehearsed to harmonize their duet.