Terzetto Terzetto is a small piece of music for three instruments or, more often, for three voices. Terzetto, sheet music:RUSALKA. Terzetto (Natasha, Miller, Prince) (Alexander Dargomyzhsky)Share this:Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Telegram (Opens in new window)