Like many Tangara species, Opal-rumped Tanagers are not known for their song but they do have a distinctive call. Three kinds of vocalizations have been described in the literature. Common foraging calls are described as a series of rapid high pitched, thin, sit or siz notes repeated in bursts of two or three to form a series of six or more notes. The song is described as a weaker sequence of tiz notes that quickly rise and fall in pitch, e.g. tiz-tiz-tiz-ti’ti-ti-E’E-ti-ti-ti-tiz (Hilty 2003). A high-pitched twittering noise has also been observed during flight (Restall et al. 2007).