The song of the Bay-headed Tanager in Trinidad has been described as "a rather slow 5-note sequence, seee, see, see, tsou tsooy, the last 2 notes lower in pitch" (ffrench 1991). The song in Costa Rica is described as "a series of 4-6 thin, wiry notes descending in pitch, with a peculiar whining twang" (Stiles and Skutch 1989). A vocalization in Peru that may be a song was described as "a high, wiry series, the final 2 notes descending: 'tsip si tsew-tsew' " (Lane, in Schulenberg et al. 2007). Songs in Brazil are described as rapid "tictictic-tjùw" (Perlo 2009).
Calls are heard much more frequently than is the song. In Costa Rica the principal calls are "a sibilant tsip and a wiry, squeaky tzeeik or weeit" (Stiles and Skutch 1989). Calls in Colombia and in Venezuela include "a buzzy seeaaeeee, mid. part slurred lower" (Hilty and Brown 1986, Hilty 2003), and (Colombia) "a coarse shree like Emerald Tanager" (Tangara florida) (Hilty and Brown 1986). The Bay-headed Tanager also has a twitter in flight (Trinidad; ffrench 1991). Calls in Peru are described as "a descending, loud 'tseeu!' and a rising 'tsui' " (Lane, in Schulenberg et al. 2007).