Song is a short series of 2 to several extremely high, thin, slightly descending notes — 'tseeet, tseeet, tsee...' — likely doubling as a contact call; birds sing a few times then fall silent for minutes. Also a soft drum. Search Xeno-canto and Macaulay Library for 'Picumnus nigropunctatus' / 'Black-dotted Piculet' (the alternate English name 'Black-dotted Piculet' returns more recordings).