White-rumped Tanagers perch in trees and duet early in the morning, usually after dawn (Isler and Isler 1999, Ridgely and Tudor 1989, Ridgely and Tudor 2009). The male starts the duet, continuously producing a low churring that becomes a vigorous staccato rattle, then the female joins by singing a loud, melodic "wee-o-ta-CHEE-ocheeo…," repeating this melody several times (Isler and Isler 1999, Restall et al. 2007). During their duet, other members of the group, which may be family, perch nearby, but do not sing (Isler and Isler 1999). Together, the song is similar to the duets of Campylorhynchus wrens (Ridgely and Tudor 1989). The call note of the male is reminiscent of the call of the Northern Mockingbird (Mimus polyglottos; Isler and Isler 1999). Additional recordings of their call notes and duets can be heard at both the Macaulay Library and xeno-canto websites.