The song is not heard frequently, and is usually quiet. It is a complex long series of chirps and twitters, which overall is similar to the song of a hummingbird (Ridgely and Tudor 1989, 2001, Ridgely and Greenfield 2009) or of a Hemispingus tanager (Hilty et al. 1979). It consists of unmusical monotone chirps and twitters and is 15-60 seconds long (Hilty and Brown 1986). Fjeldså and Krabbe (1990) describe the song as an unmusical, continuous weaving twitter reminiscent to that of the Gray-hooded Bush Tanager (Cnemoscopus rubrirostris). Lane (in Schulenberg et al. 2007) describe it as "a jerky, disjointed series of high, squeaky notes: 'tseep-tseu-teep-ti-tsip-tseep ....' " Call notes include soft, high chirps (Hilty et al. 1979, Hilty and Brown 1986). Additional recordings of vocalizations are available at Macaulay Library and at xeno-canto.