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The chestnut-bellied seed finch (Sporophila angolensis) is a species of bird in the family Thraupidae, but was until recently placed in Emberizidae.

It is found widely in shrubby and grassy areas in tropical and subtropical South America. Commonly known as "Curió" in most of the continent, specially in Brazil. In the Guyanas it is known as "Towa Towa". It has been replaced west of the Andes (and in Central America) by the closely related thick-billed seed finch (S. funerea), in which the male lacks the chestnut belly of the male chestnut-bellied seed-finch. The best singers are from Brazil (chestnut-bellied seed finch - Sporophila angolensis), where local breeders have developed breeding techniques which are helping growing population of the bird thus helping to reduce illegal traffic of the species. The two have often been considered conspecific as the lesser seed-finch, using the older scientific name O. angolensis.

https://en.wikipedia.org/wiki/Chestnut-bellied_seed_finch

Picture by Dario Sanches from São Paulo, Brazil, CC BY-SA 2.0 , via Wikimedia Commons

The common nightingale, rufous nightingale or simply nightingale (Luscinia megarhynchos), is a small passerine bird best known for its powerful and beautiful song. It was formerly classed as a member of the thrush family Turdidae, but is now more generally considered to be an Old World flycatcher, Muscicapidae. It belongs to a group of more terrestrial species, often called chats.

https://en.wikipedia.org/wiki/Common_nightingale

The rufous-bellied thrush (Turdus rufiventris) is a songbird of the thrush family (Turdidae). It occurs in most of east and southeast Brazil from Maranhão south to Rio Grande do Sul states, Bolivia, Paraguay, Uruguay and central regions of Argentina.

https://en.wikipedia.org/wiki/Rufous-bellied_thrush