The song of Amazonian Grosbeak is described as "a variable, pleasant, weak series of chiming notes that normally ends off-key: pee tee-tu-tu-ti-pee'chee" (Lane, in Schulenberg et al. 2010), and as "a rising-falling, slightly lilting, 2.2-2.6-sec series of ringing, whistled notes with a slight lisp, esp. at end" (Herzog et al. 2016). Compared to its sister species, Blue-black Grosbeak (Cyanoloxia cyanoides), the song of Amazonian Grosbeak has shorter notes, given at a faster rate, and the song has fewer inflections (García et al. 2016). Amazonian Grosbeak sings from concealed sites with dense understory (Hilty 2003).
The most frequent call of Amazonian Grosbeak is described as a sharp, harsh, dry tchit (Lane, in Schulenberg et al. 2010, Herzog et al. 2016).