cabaletta

(kăbˌə-lĕtˈə, käˌbə-)

1. a. A short aria that has a repetitive rhythm and a simple style.
   b. The final section of an aria or duet marked by a quick uniform rhythm.
2. Something likened to such a short aria or a final section of a piece: “And a chronic chorus of cascades and birds/Cuts loose in a wild cabaletta” (W.H. Auden).