Here are three examples of Cinnamon Becards (Pachyramphus cinnamomeus) recorded at the El Pizote, near Puerto Viejo de Talamanca (Costa Rica), 6/22 and 6/23/99. Their calls are almost definitively "plaintive".
Photo by . License: Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.