Additionally, Loronix comment section told me that Nelly Martins was married with the mighty Maestro Radames Gnattali, which is also the arranger of Encontro no Sabado.
Nelly Martins did not leave many records, only some 78RPMs and two LPs, Encontro no Sabado (this album) and an amazing instrumental piano album recorded in duo with Radames Gnattali, Radames Gnattali & Nelly Martins - Piano Duo (1967). What a nice story. Nelly Gnattali is also a gifted pianist and today works on preserving the memory of Radames Gnattali. Part of her work is available at Radames Gnattali official website, here. And as a last minute information, I found a YouTube video with Nelly Martins singing and Radames Gnattali performing at the piano, here. I said this post is amazing! Tracks include:
01 - Encontro no Sábado (Tito Madi / Georges Henry)
02 - Se (Mário Albanese / Nagib Nader)
03 - Quero-te Assim (Tito Madi)
04 - Faz Tanto Tempo (Tito Madi)
05 - Por Que (Pedro Dellober)
06 - És Tu (Domicio Augusto / Milton Silva)
07 - Eu e Você (Tito Madi)
08 - Esquece-me (Gabriel Migliori / Hélio Prado)
09 - Olha-me Diga-me (Tito Madi)
10 - Palavras ao Vento (Sergio Malta)
11 - Que Coisa Louca (C'est Magnifique) (Cole Porter / Vrs. João de Barro)
12 - Tu e Eu (Altamiro Carrilho / Armando Nunes)
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My apologies, the back cover was not included. You can grab it here, with no Rapidshare. Thanks!