The vocalizations for the Gray-bellied Flowerpiercer are generally high-pitched. The song has been described as a complex series of high-pitched notes that last up to 3 seconds and repeat every few seconds during peak bouts. There is a mixture of pure and nasally notes with a wide variation. The song sounds similar to “peeza-peeza-seetza’sizza-peeza-teez-teez’za-te-za-te-t-t” (Hilty 2011). The song then trails off and ends in a series of slower, incomprehensible notes. Additional audio recordings of vocalizations of the Gray-bellied Flowerpiercer can be heard at Macaulay Library and at xeno-canto. No calls of D. carbonaria have been discovered.